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Northwest University of Science and Technology (2003)

Characterization of Canopy Temperature in Different Wheat Genotypes under Drought Condition

Feng Bai Li

Titre : Characterization of Canopy Temperature in Different Wheat Genotypes under Drought Condition

Auteur : Feng Bai Li

Grade : Doctoral Dissertation 2003

Université : Northwest University of Science and Technology

Résumé partiel
Different of wheat genotypes material in the same climate, soil and cultivation conditions canopy temperature differences, there are a lot of reports at home and abroad. In view of the introduction of superior varieties Renyi Nong-ecological regions always play a leading role in the local production of varieties beyond the premise, the varieties of the Zhang Songwu to play a leading role in the local agro-ecological conditions as a control, where the canopy temperature (hypothermia ) and the control varieties, fairly or consistently low species called cold type wheat ; called warm type wheat varieties than the control variety of persistently high. Differences in canopy temperature in wheat heading and flowering previously there is reflected most clearly filling. A large number of studies have shown that high-and low-temperature properties of different wheat is fairly stable and not change due to turnover of the year, the weather changes. In normal years, compared with the control varieties of cold type wheat leaf functional, chlorophyll content, protein nitrogen content, of critical defense reactive oxygen poisoned protection enzyme activity, transpiration rate and net photosynthetic rate was excellent, more is better than warm type wheat. When the environmental and ecological conditions, especially when the weather conditions anomalous cold type wheat of the inner and outer traits whether it still showed relatively better characteristics, especially drought-resistant wheat is also similar to cold type wheat or similar characteristics, which is obviously of Wheat Drought cultivation and breeding are of great significance. Tests Northwest Agriculture and Forestry University of Science and Technology, 1999-2003 agricultural a station testing ground for select typical cold and warm type wheat from canopy temperature point selected from the production of drought-resistant performance typical drought and non-drought-resistant wheat In order to ensure adequate drought conditions, the tests carried out in the field at the same time, artificial structures drought shed, cut off the outside water supply after the jointing stage. Different genotypes of wheat during seed of Canopy temperature, leaf senescence dynamic leaf physiological metabolic parameters - net photosynthetic rate, transpiration rate, stomatal conductance, chlorophyll content, soluble protein content of malondialdehyde (MDA), super Determination of the activity of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) and endogenous hormone ABA, root injury traffic grain dry matter accumulation dynamics indicators to study the different genes under drought conditions the cold temperature, and its biological characteristics of the type of wheat, and revealed the law of dryland wheat production were discussed. The test results show that : 1. Cold type wheat under drought conditions, the canopy temperature is consistently low, warm type wheat Canopy temperature remained high, of different temperatures wheat groups of temperature change is quite stable, does not change due to changes in the test year. Drought-resistant wheat with cold type wheat temperature characteristics, rather than the drought-resistant wheat canopy temperature are very close and warm type wheat. 2. Under drought conditions, the different genotype wheat canopy leaves of the aging process there is a big difference in cold type wheat drought conditions different genotype wheat canopy temperature and biological characteristics of resistance to early green leaves of wheat during the grain filling leaf position function of long canopy leaf area of ??long duration, slow decomposition of chlorophyll, these characteristics for three consecutive years to be reflected. Warm type wheat resistance to early wheat showed the opposite. Function of the length of the grain filling period leaves the aging process as well as the leaves dry dead time from the mature wheat metabolism has essentially

Mots clés : Wheat Drought Canopy temperature The biology features : Aging

Présentation (Dissertationtopic)

Page publiée le 3 mai 2013, mise à jour le 21 avril 2018