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Physiological and Biochemical Effects of 24-Epibrassinolide on heat-stress Adaptation in Maize (Zea mays L.)

Natural Science 2016年第4期8卷 171-179页

作者： Pranjal Yadava Jyoti Kaushal Anuradha Gautam Hemangini Parmar Ishwar Singh ICAR-Indian Institute of Maize Research Pusa Campus New Delhi India Sam Higginbottom Institute of Agriculture Technology & Sciences Allahabad India

Brassinosteroids (BRs) are a family of about 70 structurally related polyhydroxy steroidal phytohormones that regulate a number of physiological processes in plants. Among these, brassinolide (BL), 28-homobrassinolide (28-homoBL) and 24-epibrassinolide (24-EpiBL) are more common. The present study aims at studying the usefulness of 24-epiBL in ameliorating the impacts of heat-stress in maize along with its role in regulating cellular antioxidant defense system. Maize hybrid PMH 3 was grown in pots in a green house maintained at 14 hours day (25℃)/10hours night (17℃). A solution of 24-epiBL (1 μM) was applied externally at V4 stage. Leaf tissues were sampled from both treated and control plants. Subsequently, both the groups of pots were placed in plant growth chamber maintained at high temperature (48℃;RH 50%). Plants were sampled for biochemical analysis after 3, 6, 9, 24 and 48 hours of high temperature exposure. Exogenous application of 24-EpiBL arrested protein degradation and enhanced cell membrane stability, as compared to the control. The biochemical activities of antioxidant enzymes such as catalase (CAT), superoxide dismutase (SOD) and peroxidase (POX) were found to be dynamically and variably modulated post 24-epiBL treatment. Thus, the study supports the role of BRs as anti-stress agents.

关键词： Brassinosteroid Maize heat-stress

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Genome wide investigation of Hsf gene family in Phoebe bournei: identification, evolution, and expression after abiotic stresses

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JOURNAL OF FORESTRY RESEARCH 2024年第1期35卷 1-15页

作者： Liao, Wenhai Tang, Xinghao Li, Jingshu Zheng, Qiumian Wang, Ting Cheng, Shengze Chen, Shiping Cao, Shijiang Cao, Guangqiu Fujian Agr & Forestry Univ Coll Forestry Fuzhou 350002 Peoples R China Univ Key Lab Forest stress Physiol Ecol & Mol Biol Fuzhou 350002 Peoples R China Fujian Acad Forestry Sci Fuzhou 350012 Peoples R China Fujian Agr & Forestry Univ Coll Plant Protect Fuzhou 350002 Peoples R China

heat shock transcription factors (Hsfs) have important roles during plant growth and development and responses to abiotic stresses. The identification and function of Hsf genes have been thoroughly studied in various herbaceous plant species, but not woody species, especially Phoebe bournei, an endangered, unique species in China. In this study, 17 members of the Hsf gene family were identified from P. bournei using bioinformatic methods. Phylogenetic analysis indicated that PbHsf genes were grouped into three subfamilies: A, B, and C. Conserved motifs, three-dimensional structure, and physicochemical properties of the PbHsf proteins were also analyzed. The structure of the PbHsf genes varied in the number of exons and introns. Prediction of cis-acting elements in the promoter region indicated that PbHsf genes are likely involved in responses to plant hormones and stresses. A collinearity analysis demonstrated that expansions of the PbHsf gene family mainly take place via segmental duplication. The expression levels of PbHsf genes varied across different plant tissues. On the basis of the expression profiles of five representative PbHsf genes during heat, cold, salt, and drought stress, PbHsf proteins seem to have multiple functions depending on the type of abiotic stress. This systematic, genome-wide investigation of PbHsf genes in P. bournei and their expression patterns provides valuable insights and information for further functional dissection of Hsf proteins in this endangered, unique species.

关键词： Phoebe bournei Hsf gene family Evolutionary analysis Expression mechanism Abiotic stresses MULTIPLE SEQUENCE ALIGNMENT TRANSCRIPTION FACTORS HSFS heat-stress ACTIVATOR FUNCTION ARABIDOPSIS DIVERSITY POPULATIONS ADAPTATION MOTIFS DOMAIN

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Positive effect of porphyrans on the lifespan and vitality of Drosophila melanogaster

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Chinese Journal of Oceanology and Limnology 2007年第4期25卷 373-377页

作者：赵婷婷张全斌綦慧敏李智恩 Institute of Oceanology Chinese Academy of Sciences

The effects of degraded porphyran (P1) and natural porphyran (P) on the lifespan and vitality of Drosophila melanogaster are studied. The porphyrans, added daily to the food medium at 0.2% and 1% concentrations, can significantly increase the lifespan in average of 55.79 and 58.23 d in 0.2% P1 diet females and 1% P1 diet males, extending by 12.29% and 8.60% over the corresponding controls, respectively. The effects of porphyrans on D. melanogaster in heat-stress condition were also examined, and found a remarkable increase in survival time. The results which are consistently associated with the use of porphyrans are related to their free radical scavenger action. Considerable increase in vitality demonstrated that vitalities of middle-aged fly (assessed by measuring their mating capacity) was observed after porphyrans addition. Therefore, porphyrans are effective in reducing the rate of aging, and P1 in low molecular weight is better than natural P.

关键词： Drosophila melanogaster porphyrans lifespan heat-stress mating capacity

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