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The Lateral Root Developmental Plasticity and Regulation Mechanism by Re-Watering after Draught Stress

Author: ChengHanTing
Tutor: HuJingJiang；MuZiXin
School: Northwest University of Science and Technology
Course: Botany
Keywords: Corn Lateral root Aquaporins NO H2O2
CLC: S513
Type: Master's thesis
Year: 2009
Downloads: 43
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Abstract

In this study, the high and stable production , multi-resistant of new corn variety Zhengdan , 958 test material , drought stress using PEG6000 processing analog - rehydration drought stress - rehydration corn plasticity and regulation mechanisms of lateral root development obtained The following main conclusions : 1 , three potential gradient ( - 0.4MPa - 0.8MPa -1.2MPa ) and two - time gradient (drought stress rehydration after 12h and 24h after drought stress rehydration ) study of drought stress on lateral root developmental effects of mild (-0.4MPa) stress can promote the occurrence of maize lateral extension of the growth , and in severe (-0.8MPa -1.2MPa) stress lateral root growth inhibition by varying degrees , the water potential lower longer stress time suppression effect significantly ; rehydration maize lateral appeared different degree of compensatory growth phenomenon , especially to -0.8MPa drought stress - complex maize lateral compensation in the water under the conditions of growth of the most significant . 2 , in the study of drought stress in the under -0.8MPa potential gradient - rehydration induced of maize lateral compensation growth mechanism . Expression of aquaporins in maize roots under drought stress lower than normal moisture conditions in maize roots after rewatering the aquaporin expression increased dramatically , and expression amount exceeds the amount of expression under normal growth conditions ; normally found ( I ) growth conditions of the water holes protein is uniformly distributed in the root cortical tissue , drought stress and drought stress after rewatering aquaporins are mainly distributed in the outer cortex of the root endodermis and the greater the degree of stress , the more obvious manifestations rehydration . The water holes inhibitors HgCl2 preliminary evidence of the occurrence of lateral roots in this process is mediated by aquaporins . ( II ) of drought stress on the content of corn roots NO content lower than normal growth conditions , higher than under normal conditions, the content of NO content after rehydration , consistent with its content changes and lateral root development rules , further pharmacological tests proved NO - rehydration induced maize lateral development is closely related to drought stress . (Ⅲ) H ₂ O ₂ able to some extent to promote the growth and development of the maize lateral shows that drought - the rehydration process maize lateral developmental plasticity may be affected by water porin , NO and H _{2 O _{2 < / sub > and many other factors , and regulation .}}

The Lateral Root Developmental Plasticity and Regulation Mechanism by Re-Watering after Draught Stress

Abstract

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