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The relationships between maize(Zea mays L.)lodging resistance and yield formation depend on dry matter allocation to ear and stem

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The Crop Journal 2023年第1期11卷 258-268页

作者： Ping Zhang Shuangcheng Gu Yuanyuan Wang Chenchen Xu Yating Zhao Xiaoli Liu Pu Wang Shoubing Huang College of Agronomy and Biotechnology China Agricultural UniversityBeijing 100193China College of Agronomy South China Agricultural UniversityGuangzhou 510642GuangdongChina

Lodging is a critical constraint to yield *** appear to be tradeoffs between yield formation and lodging resistance in ***,it is feasible to reduce lodging risk as well as increase grain yield by optimizing dry-matter allocation to different organs under different environments.A three-year field experiment was conducted using four maize cultivars with differing lodging resistances and five growing environments in 2018–***-susceptible(LS)cultivars on average yielded more than lodging-resistant(LR)cultivars when lodging was not *** yield components kernel number per ear(KN)and thousand-kernel weight(TKW)were both negatively correlated with lodging resistance traits(stalk bending strength,rind penetration strength,and dry matter weight per internode length).Before silking,the LR cultivar Lishou 1(LS1)transported more assimilates to the basal stem,resulting in a thicker basal stem,which reduced dry matter allocation to the ear and in turn *** lower KN of LS1 was also due partly to the lower plant height(PH),which increased lodging resistance but limited plant dry matter *** contrast,the LS cultivars Xianyu 335(XY335)and Xundan 20(XD20)produced and allocated more photoassimilates to ears,but limited dry matter allocation to *** silking,LS cultivars showed higher TKW than LR cultivars as a function of high photoassimilate productivity and high assimilate allocation to the *** higher lodging resistance of LS1 was due mainly to the greater assimilate allocation to stem after silking and lower PH and ear height(EH).High-yielding and high-LR traits of Fumin(FM985)were related to optimized EH and stem anatomical structure,higher leaf productivity,low assimilate demand for kernel formation,and assimilate partitioning to ear.A high presilking temperature accelerated stem extension but reduced stem dry matter accumulation and basal stem ***-silking temperature influences lodging resistance and yield m

关键词： Corn Lodging Yield formation Physical traits dry matter allocation

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Physiological response of four wolfberry (Lycium Linn.) species under drought stress

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Journal of Integrative Agriculture 2018年第3期17卷 603-612页

作者： ZHAO Jian-hua LI Hao-xia ZHANG Cun-zhi AN wei YIN Yue WANG Ya-jun CAO You-long National Wolfberry Engineering Research Center Ningxia Academy of Agriculture and Forestry Sciences Yinchuan 750002 P. R. China Desertification Control Research Institute Ningxia Academy of Agriculture and Forestry Sciences Yinchuan 750002 P.R.China Ningxia Professional Technology College Yinchuan 750021 P.R. China

We studied gas-exchange, chlorophyll pigments, lipid peroxidation, antioxidant enzymes, and biomass partitioning responses in seedlings of four wolfberry species （Lycium chinense Mill. var. potaninii （Pojark.） A. M. Lu, Lycium chinense Mill., Lycium barbarum L., and Lycium yunnanense Kuang ＆ A. M. Lu） under four water supply regimes. In all four species, drought affected seedlings in terms of chlorophyll content, net photosynthesis rate （Pn）＇ transpiration rate （E）, and lipid peroxidation. Drought also increased some antioxidant enzyme activities, such as peroxidase （POD）, catalase （CAT）, superoxide dismutase （SOD）, and ascorbate peroxidase （APX）. Significant changes in dry biomass partitioning also occurred in response to water stress. In particular, dry biomass of leaves and fruits decreased significantly. L. chinense Mill. and L. barbarum L. possessed greater drought tolerance and exhibited superior antioxidant processing ability and other related physiological traits compared to the other two species. L. chinense Mill. was the most tolerant to all levels of drought. In contrast,L, yunnanense Kuang ＆ A. M. Lu was more affected by water supply and had the lowest resistance to drought stress. These findings would provide some important information regarding genetic resources for future forest tree improvement in relation to drought tolerance.

关键词： drought Lycium Linn. chlorophyll fluoresc.ence osmotic adjustment antioxidant respond dry matter allocation

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