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Accueil du site → Doctorat → Chine → 2005 → Effects of High Temperature and Drought on Starch Synthesis in Grains, Peocessing Quality and Yield in Winter Wheat (Triticum aestivum L.)

Henan Agricultural University (2005)

Effects of High Temperature and Drought on Starch Synthesis in Grains, Peocessing Quality and Yield in Winter Wheat (Triticum aestivum L.)

Wang Chen Yang

Titre : Effects of High Temperature and Drought on Starch Synthesis in Grains, Peocessing Quality and Yield in Winter Wheat (Triticum aestivum L.)

Auteur : Wang Chen Yang

Grade : Doctoral Dissertation 2005

Université : Henan Agricultural University

Résumé partiel
Different Gluten Wheat varieties for two years in a row the potted growth simulation planted with pool water control and field experiments, in-depth research the the major adversity ecological impact of China’s wheat production and quality factor - Flower high temperature and drought on wheat grain starch synthesis key enzymes, starch, starch pasting properties, processing quality and yield of clear different stages after flowering characteristics of different high temperature and drought stress intensity flour, pasta products quality and yield and photosynthetic physiological changes clarified the different irrigation effect on the regulation of the quality and yield of wheat processing, to achieve wheat quality adversity yield planting theoretical basis and practical attempt. The main contents and results are as follows : a strong gluten varieties Yumai 34 and weak gluten cultivar Yumai 50 material, using a pot experiment with climate chamber combining growth simulation method to study the different stages of high temperature after flowering drought and their interaction on the impact of the activity of grain starch synthesis key. The results showed that, after flowering, high temperature or soil drought have led to grain UDPG-PPase ADPG-PPase, SSS and SBE activity, exacerbated by the impact of advancing with the growth period. The performance of the different tendons force type varieties have significant difference : Yumai 34 by drought stress larger, different water treatments grain activity of UDPG-PPase, ADPG-PPase, SSS and SBE the difference reached a significant level ; high temperature stress significantly with the impact of activity of UDPG-PPase and ADPG-PPase activity, but had no significant effect on the SSS and SBE. Yumai 50 performance for the effect of heat stress is greater than drought, high temperature stress so ADPG-PPase and SSS activity decreased significantly, UDPG-PPase activity reached significantly with the level of (P lt ; 0.05), but the impact on the SBE not significant with ; only SSS activity significantly influence soil drought, but other enzyme activity was not significant. Second, in the same test, study after flowering, high temperature, drought, and their interaction on the flag leaf photosynthetic performance and sucrose synthase activity. The results show that the high temperature or drought stress are the early grain filling stage and the interim flag leaf Fo increases, the later decline of Fm, Fv impact, thereby significantly reducing the flag leaf Fv / Fm, Fv / Fo, qN and Pn, indicating that Effects of stress significantly reduced activity and photochemical efficiency of PS Ⅱ potential impact trend was exacerbated with the process of plant senescence. The results also showed that there are superimposed effect of high temperature and drought stress on the flag leaf Fv / Fo and Fv / Fm such as the impact of, and in Fv / Fm, qN on the existence of a significant interaction effect of high temperature and drought. Sucrose synthesis key enzymes studies have shown that high temperature and drought stress led to SPS and SS activity decreased flag leaf which Yumai 50 flag leaves SS and SPS activity are subject to high temperatures affect 1% of the difference between the large and significant level ; flags Leaf SS activity under drought stress affect up to 5% significance level, SPS activity by water had no significant effect. Yumai 34 flag leaves SS and SPS activity affected by high temperature reached 5% significant level of SPS activity in drought-affected 1% significant level, while the SS by drought stress is not obvious. After flowering, leaf photosynthetic performance under the conditions of high temperature stress and soil drought weakened sucrose synthesis capacity decreased the direct physiological reason for the decline in yield and quality resulting in lack of grain starch synthesis and accumulation.

Mots clés : High temperature Arid Winter Wheat Different Gluten -type varieties Starch synthesis key enzyme Starch properties Processing quality

Présentation (Dissertationtopic)

Page publiée le 3 mai 2013, mise à jour le 22 avril 2018