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Study on Physiological Characteristics of Drought Resistance on Malus Sieversii (Ledeb.) Rome.

Author: GuoXianPing
Tutor: WangYanLing；LiaoKang
School: Xinjiang Agricultural University
Course: Pomology
Keywords: Xinjiang wild apple Water Stress Photosynthetic physiology Osmolytes Protective enzymes
CLC: S661.1
Type: Master's thesis
Year: 2009
Downloads: 209
Quote: 0
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Abstract


The potted Xinjiang wild apple seedlings as the research object, different processing time by in three water gradient (soil relative water content of 70 to 75%, 50 to 55%, 30 to 35%), photosynthetic physiology, osmolytes and reactive oxygen balance study to examine the impact of water stress on Xinjiang wild apple photosynthetic physiology, osmotic adjustment substances and reactive oxygen balance and Xinjiang wild apple adaptation mechanisms to water stress. The main results are as follows: 1. Normal moisture conditions, Xinjiang wild apple with the control varieties Huang Taiping LSP were 1550μmol · m-2 · s-1 and 1500μmol · m-2 · s-1 LCP respectively 30.32μmol · m-2, s-1 and 44.13μmol · m-2 · s-1, CE respectively 0.048mol · m-2 · s-1 and 0.028mol · m-2 · s-1, show that Xinjiang wild apple light ecological adaptation capacity and utilization of CO2 were higher than Huang Taiping. Xinjiang wild apple and Huang Taiping maximum net photosynthetic rate were 20.64μmolCO2 · m-2 · s-1 and 9.40μmolCO2 · m-2 · s-1 Description Xinjiang wild apple with a strong accumulation of dry matter physiological basis for plant growth and resilience provides the material basis. Same optimum light intensity and CO2 concentration, the same atmospheric temperature and humidity ecological factors conditions, different treatment days Xinjiang wild apple Huang Taiping Pn based on moderate and severe water stress continue to reduce severe water stress on the 30th day reaches the maximum difference with the control, respectively, lower than the respective control 62.62% and 81.09%, respectively, and Xinjiang wild apple in water gradient Pn are greater than Huang Taiping. Water stress treatment for 16 days, Xinjiang wild apple Pn diurnal variation control and moderate water stress conditions Pn change is not typical bimodal the Pn decreased by stomatal factors, and severe water stress as a serious lunch break The type and Pn decline is caused by non-stomatal factors. Huang Taiping three moisture gradient Pn lunch break, and Pn are serious changes caused by non-stomatal factors. The M. sieversii in three moisture gradient mean Pn day and WUE daily average greater than Huang Taiping. Water stress 28 days, severe water stress Xinjiang wild apple Huang Taiping Fo increased compared with the control 8.36% and 52.93%, indicating the degree of inhibition of Huang Taiping PS Ⅱ reaction center are more serious than the Xinjiang Wild Apple. Heavy degree of moisture stress so that Xinjiang wild apple and Huang Taiping Fm ratio control decreased by 3.69% and 5.88%, Xinjiang wild apple FV / FM 0.78, while Huang Taiping only 0.68, in severe water stress under Huang Taiping has been photoinhibition extent greater than M. sieversii . Fm and Fv / Fm recovery after rehydration with the control was no significant difference, indicating that photoinhibition is basically a reversible center inactivation caused. Xinjiang wild apple and Huang Taiping leaf cell membrane permeability and MDA content increased with increased water stress increases, they also to reduce adversity damage caused by osmotic adjustment substances and protective enzymes to maintain normal physiological activities. Xinjiang wild apple plasma membrane hurt time and membrane lipid peroxidation after Huang Taiping. Severe water stress on the 30th day Xinjiang wild apple Huang Taiping membrane relative permeability than the control, respectively increased by 35.21% and 38.33%, MDA content increased by 32.86% and 49.54%, respectively, compared with the control, the extent of Xinjiang wild apple by water stress injury less than Huang Taiping and Xinjiang wild apple recover after rehydration better, Xinjiang wild apple ability to adapt to water stress than Huang Taiping.

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CLC: > Agricultural Sciences > Gardening > Fruit trees gardening > Pome > Apple
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