Effects of Polyethylene Glycol Induced Water Stress on Root Growth of Rice

doi:10.7668/hbnxb.2009.02.027

Abstract

Abstract: A solution cultiva ion experiment was conducted to study the effects of water stress on root growth of rice(Oryza sativa L.) variety Jingyou 402 cultivated in water stress condit ion simulated with PEG 50 g/L.The results obtained were as follows:Root dry weight,root diameter and active absorption surface area increased,root fresh weight,relative water content,and length decreased in 5- days water stress.Root act ive absorption surface area of+ PEG treatment was on average 6%,and the highest 47% higher than control. It was complicated by the effects of water stress on root total surface areas and fractal dimension. Root total surface area declined during the prophase of water stress,then went up and exceeded that of the control.Root fractal dimension increased more rapidly than the control and dropped markedly on the 5 th day,and then,after water stress was lifted up,rose up quickly to levels close to the control.Root total surfacewas significantly correlated to root dry weight(r²= 0.9282) A significant correlation between root act ive absorption surface area and root relative water content( r²= 0.9512) were observed.

Key words: Rice(Oryza sativa L.), Root, Polyethylene glycol(PEG) , Water stress

CLC Number:

S511.01

GAO Zhi-hong, CHEN Xiao-yuan. Effects of Polyethylene Glycol Induced Water Stress on Root Growth of Rice[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2009, 24(2): 128-133. doi: 10.7668/hbnxb.2009.02.027.

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