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Effects of stress-induced ABA on root architecture development:Positive and negative actions

从植物科学到农业发展——2012全国植物生物学大会

作者： nenghui ye~1,guohui zhu~2,Yinggao Liu3~3,jianhua zhang~(1,4*) 1 CUHK Shenzhen Research Institute,The Chinese university of hong kong,hong kong,china. 2 college of life science,south china agricultural university,guangdong,china. 3 SKL of Crop biology,college of life sciences,Shandong agricultural university,china. 4 SKL of Agrobiotechnology,The Chinese university of hong kong,hong kong,china.

The antagonism between abscisic acid(ABA) and gibberellin(GA) plays a key role in controlling seed germination,but the mechanism of antagonism during this process is not *** possible links among ABA,reactive oxygen species(ROS),ascorbic acid (ASC),and GA during rice seed germination were *** in non-seed tissues where ROS production is increased by ABA,ABA reduced ROS production in imbibed rice seeds,especially in the embryo *** reduced ROS also led to an inhibition of ASC *** accumulation was also suppressed by a reduced ROS and ASC level,which was indicated by the inhibited expression of GA biosynthesis genes,amylase genes,and enzyme *** of exogenous ASC can partially rescue seed germination from ABA *** of ASC,which acts as a substrate in GA biosynthesis,was significantly inhibited by lycorine which thus suppressed the accumulation of GA. Consequently,expression of GA biosynthesis genes was suppressed by the low levels of ROS and ASC in ABA-treated *** can be concluded that ABA regulates seed germination in multiple *** and ASC are involved in its inhibition of GA biosynthesis.

关键词： ABA ascorbic acid GA reactive oxygen species rice(Oryza sativa) seed germination.

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The Crop Journal 2023年第4期11卷 1072-1079页

作者： Zhenning Teng Jiahan Lyu Yinke Chen jianhua zhang nenghui ye Shenzhen Research Institute The Chinese University of Hong KongShenzhen 518057GuangdongChina college of Agriculture Hunan Agricultural UniversityChangsha 410128HunanChina department of biology Hong Kong Baptist UniversityKowloonHong KongChina School of life sciences and State Key Laboratory of Agrobiotechnology The Chinese University of Hong KongShatinHong KongChina Hunan provincial Key Laboratory of Rice Stress biology Hunan Agricultural UniversityChangsha 410128HunanChina

Root architecture development,an agronomic trait that influences crop yield,is regulated by multiple plant *** acid(ABA)is a stress hormone that responds to multiple stresses,including salt,drought,and cold stress,and modulates various aspects of plant growth and *** recent years,it has been found that ABA synthesized under mild stress or well-watered conditions can support plant growth and stress resistance by positively regulating root architecture *** this review,we summarize the molecular,cellular,and organismal basis of ABA homeostasis in the root and how ABA signaling affects root architecture development both as an inhibitor and as an *** discuss the implications of these studies and the potential for exploiting the components of ABA signaling in designing crop plants with improved root system development and stress resistance.

关键词： Abscisic acid Roots Growth and development Homeostasis

The response of roots and the rhizosphere environment to integrative cultivation practices in paddy rice

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Journal of Integrative Agriculture 2024年第6期23卷 1879-1896页

作者： Hanzhu Gu Xian Wang Minhao zhang Wenjiang Jing Hao Wu Zhilin Xiao Weiyang zhang Junfei Gu Lijun Liu Zhiqin Wang jianhua zhang Jianchang Yang Hao zhang Jiangsu Key Laboratory of Crop Genetics and Physiology/Jiangsu Key Laboratory of Crop Cultivation and Physiology/Jiangsu Co-Innovation Center for Modern production Technology of Grain Crops/agricultural college Yangzhou UniversityYangzhou 225009China Taizhou Institute of agricultural science Jiangsu Academy of Agricultural SciencesTaizhou 225300China State Key Laboratory of Agrobiotechnology School of Life SciencesThe Chinese University of Hong KongShatinHong Kong 999077China department of biology Faculty of ScienceHong Kong Baptist UniversityKowloonHong Kong 999077China

Integrative cultivation practices(ICPs)are essential for enhancing cereal yield and resource use ***,the effects of ICP on the rhizosphere environment and roots of paddy rice are still poorly *** this study,four rice varieties were produced in the *** variety was treated with six different cultivation techniques,including zero nitrogen application(0 N),local farmers’practice(LFP),nitrogen reduction(NR),and three progressive ICP techniques comprised of enhanced fertilizer N practice and increased plant density(ICP1),a treatment similar to ICP1 but with alternate wetting and moderate drying instead of continuous flooding(ICP2),and the same practices as ICP2 with the application of organic fertilizer(ICP3).The ICPs had greater grain production and nitrogen use efficiency than the other three *** length,dry weight,root diameter,activity of root oxidation,root bleeding rate,zeatin and zeatin riboside compositions,and total organic acids in root exudates were elevated with the introduction of the successive cultivation *** enhanced nitrate nitrogen,the activities of urease and invertase,and the diversity of microbes(bacteria)in rhizosphere and non-rhizosphere soil,while reducing the ammonium nitrogen *** nutrient contents(ammonium nitrogen,total nitrogen,total potassium,total phosphorus,nitrate,and available phosphorus)and urease activity in rhizosphere soil were reduced in all treatments in comparison with the non-rhizosphere soil,but the invertase activity and bacterial diversity were *** main root morphology and physiology,and the ammonium nitrogen contents in rhizosphere soil at the primary stages were closely correlated with grain yield and internal nitrogen use *** findings suggest that the coordinated enhancement of the root system and the environment of the rhizosphere under integrative cultivation approaches may lead to higher rice production.

关键词： rice(Oryza sativa L.) nitrogen use efficiency grain yield integrative cultivation practices roots

Identification of microRNAs regulating grain filling of rice inferior spikelets in response to moderate soil drying post-anthesis

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The Crop Journal 2022年第4期10卷 962-971页

作者： Zhenning Teng Yinke Chen Youqing Yuan Yaqiong Peng Yake Yi Huihui Yu Zhenxie Yi Jianchang Yang Yan Peng Meijuan Duan jianhua zhang nenghui ye college of Agriculture Hunan Agricultural UniversityChangsha 410128HunanChina Hunan provincial Key Laboratory of Rice Stress biology Hunan Agricultural UniversityChangsha 410128HunanChina Changjun High School of Changsha Changsha 410128HunanChina Key Laboratory of Crop Genetics and Physiology of Jiangsu province Yangzhou UniversityYangzhou 225009JiangsuChina department of biology Hong Kong Baptist UniversityKowloon 999077Hong KongChina School of life sciences and State Key Laboratory of Agrobiotechnology the Chinese University of Hong KongShatin 999077Hong KongChina

The grain filling of inferior spikelets is much less complete than that of superior spikelets in rice cultivars with large panicles and numerous spikelets and is promoted by moderate soil drying(MD)post-anthesis.A growing body of evidence has shown that microRNAs function in regulating grain ***,little is known about the mechanism of microRNA control of grain filling of inferior spikelets in response to *** this study,grain filling of inferior spikelets was promoted by MD treatment in ***-RNA profiling at the most active grain-filling stage was conducted in inferior spikelets under control(CK)and MD *** 521 known and 128 novel miRNAs,38 known and 9 novel miRNAs were differentially expressed between the CK and MD *** genes of differentially expressed miRNAs were involved in multiple developmental and signaling pathways associated with catalytic activity,carbohydrate metabolism,and other *** miR1861 and miR397 were upregulated by MD,leading to a decrease in OsSBDCP1 and OsLAC,two negative regulators of SSIIIa activity and BR signaling,*** contrast,miR1432 abundance was reduced by MD,resulting in upregulation of OsACOT and thus an elevated content of both ABA and *** results suggest that both starch synthesis and phytohormone biosynthesis are regulated by differentially expressed miRNAs in inferior spikelets in response to MD *** results suggest the molecular mechanisms by which miRNAs regulate grain filling in inferior spikelets of rice under moderate soil drying,providing potential application in agriculture to increase rice yields by genetic approaches.

关键词： Moderate soil drying Grain filling Inferior spikelet MicroRNA Rice

Drought stress and plant ecotype drive microbiome recruitment in switchgrass rhizosheath

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Journal of Integrative Plant biology 2021年第10期63卷 1753-1774页

作者： Tie-Yuan Liu nenghui ye Xinyu Wang Debatosh Das Yuxiang Tan Xiangkai You Mingxiu Long Tianming Hu Lei Dai jianhua zhang Mo-Xian Chen college of Grassland Agriculture Northwest A&F UniversityYangling 712100China Co-Innovation Center for Sustainable Forestry in southern china College of Biology and the EnvironmentNanjing Forestry UniversityNanjing 210037China CAS Key Laboratory of Quantitative Engineering biology Shenzhen Institute of Synthetic BiologyShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China southern Regional Collaborative Innovation Center for Grain and Oil Crops in china College of AgricultureHunan Agricultural UniversityChangsha 410128China State Key Laboratory of Agrobiotechnology The Chinese University of Hong KongShatinHong Kong 999077China department of biology Hong Kong Baptist UniversityKowloonHong Kong 999077China

The rhizosheath,a layer of soil grains that adheres firmly to roots,is beneficial for plant growth and adaptation to drought *** is a perennial C4 grass which can form contact rhizosheath under drought *** this study,we characterized the microbiomes of four different rhizocompartments of two switchgrass ecotypes(Alamo and Kanlow)grown under drought or well-watered conditions via 16S ribosomal RNA amplicon *** four rhizocompartments,the bulk soil,rhizosheath soil,rhizoplane,and root endosphere,harbored both distinct and overlapping microbial *** root compartments(rhizoplane and root endosphere)displayed low-complexity communities dominated by proteobacteria and *** to bulk soil,Cyanobacteria and Bacteroidetes were selectively enriched,while proteobacteria and Firmicutes were selectively depleted,in rhizosheath *** from proteobacteria or Firmicutes were specifically selected in Alamo or Kanlow rhizosheath *** drought stress,Citrobacter and Acinetobacter were further enriched in rhizosheath soil,suggesting that rhizosheath microbiome assembly is driven by drought ***,the ecotype-specific recruitment of rhizosheath microbiome reveals their differences in drought stress ***,these results shed light on rhizosheath microbiome recruitment in switchgrass and lay the foundation for the improvement of drought tolerance in switchgrass by regulating the rhizosheath microbiome.

关键词： 16S rRNA sequencing rhizosphere rhizosheath formation switchgrass(Panicum virgatum L.) water deficiency

OsDMI3 Is a Novel Component of Abscisic Acid Signaling in the Induction of Antioxidant Defense in Leaves of Rice

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Molecular Plant 2012年第6期5卷 1359-1374页

作者： Ben Shi Lan Ni Aying zhang Jianmei Cao hong zhang Tingting Qin Mingpu Tan jianhua zhang Mingyi-Jiang college of life sciences Nanjing Agricultural UniversityNanjing 210095China National Key Laboratory of Crop Genetics and Germplasm Enhancement Nanjing Agricultural UniversityNanjing 210095China department of biology Hong Kong Baptist UniversityHong KongChina

Ca^2＋ and calmodulin （CAM） have been shown to play an important role in abscisic acid （ABA）-induced anti- oxidant defense. However, it is unknown whether Ca^2＋/CaM-dependent protein kinase （CCaMK） is involved in the pro- cess. In the present study, the role of rice CCaMK, OsDMI3, in ABA-induced antioxidant defense was investigated in leaves of rice （Oryza sativa） plants. Treatments with ABA, H2O2, and polyethylene glycol （PEG） induced the expression of OsDMI3 and the activity of OsDMI3, and H2O2 is required for the ABA-induced increases in the expression and the activity of OsDMI3 under water stress. Subcellular localization analysis showed that OsDMI3 is located in the nucleus, the cytoplasm, and the plasma membrane. The analysis of the transient expression of OsDMI3 in rice protoplasts and the RNA interference （RNAi） silencing of OsDMI3 in rice protoplasts showed that OsDMI3 is required for ABA-induced increases in the expression and the activities of superoxide dismutase （SOD） and catalase （CAT）. Further, the oxidative damage induced by higher concentrations of PEG and H202 was aggravated in the mutant of OsDMI3. Moreover, the analysis of the RNAi silencing of OsDMI3 in protoplasts and the mutant of OsDMI3 showed that higher levels of H2O2 accumulation require OsDMI3 activation in ABA signaling, but the initial H2O2 production induced by ABA is not depend- ent on the activation of OsDMI3 in leaves of rice plants. Our data reveal that OsDMI3 is an important component in ABA-induced antioxidant defense in rice.

关键词： OsDMI3 abscisic acid antioxidant defense H202 oxidative stress signal transduction.

Irrigating with cooler water does not reverse high temperature impact on grain yield and quality in hybrid rice

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The Crop Journal 2023年第3期11卷 904-913页

作者： Wanju Shi Xinzhen zhang Juan Yang Somayanda M.Impa De Wang Yusha Lai Zijin Yang Hang Xu Jinshui Wu jianhua zhang S.V.Krishna Jagadish college of Agronomy Hunan Agricultural UniversityChangsha 410128HunanChina department of biology Hong Kong Baptist UniversityKowloonHong KongChina State Key Laboratory of Agrobiotechnology The Chinese University of Hong KongShatinHong KongChina department of Plant and Soil sciences Texas Tech UniversityLubbockTX 79410USA International Rice Research Institute DAPO Box 7777Metro ManilaPhilippines

Rice grain yield and quality are negatively impacted by high temperature *** water temperature significantly affects rice growth and development,thus influencing yield and *** role of cooler irrigation water in counteracting high temperature induced damages in rice grain yield and quality are not ***,in the present study two rice hybrids,Liangyoupeijiu(LYPJ)and IIyou 602(IIY602)were exposed to heat stress and irrigated with water having different temperatures in a splitsplit plot experimental *** stress was imposed starting from heading until maturity under field-based heat tents,over two consecutive *** maximum day temperature inside the heat tents was set at 38℃.For the irrigation treatments,two different water sources were used including belowground water with cooler water temperature and pond water with relatively higher water *** mean temperatures in the heat tents were increased by 1.2–2.0℃ across two years,while nighttime temperature remained similar at both within and outside the heat *** belowground water irrigation did have little effect on air temperature at the canopy level but decreased soil temperature(0.2–1.4℃)especially under *** stress significantly reduced grain yield(33%to 43%),panicles m^(-2)(9%to 10%),spikelets m^(-2)(15%to 22%),grain-filling percentage(13%to 26%)and 1000-grain weight(3%to 5%).Heat stress significantly increased chalkiness and protein content and decreased grain length and amylose *** yield was negatively related to air temperature at the canopy level and soil *** grain quality parameters like chalkiness recorded a significantly positive association with both air and soil *** with cooler belowground water reduced the negative effect of heat stress on grain yield by 8.8%in LYPJ,while the same effect was not seen in IIY602,indicating cultivar differences in their response to irrigation water ***

关键词： Grain quality Grain yield Hybrid rice High temperature Irrigation Water management