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Understanding the growth and physiological responses of rice to upland conditions would be helpful for designing treatments
to improve the tolerance of rice under a rainfed system. The objective of this study was to investigate the initiation, elongation
and membrane stability of seminal, lateral and adventitious roots of upland rice after 9-d upland condition treatment. Compared
with control roots under waterlogged conditions, upland water deficiency conditions favor seminal and lateral root growth
over adventitious root growth by accelerating seminal root elongation, promoting lateral root initiation and elongation, and
reducing the elongation and number of adventitious roots. Enhanced total root number and length resulted in increase of total
root dry weight and thereby increasing the root-to-shoot ratio. Organic compound leakage from seminal root tips and adventitious
roots increased progressively to some extent with upland culture duration, while significant increases in semial root tips
were the consequence of loss of membrane integrity caused by the upland-condition enhanced growth.
Project (No. G1999011700) supported by National Key Basic Research Special (863) Foundation of China 相似文献
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Aluminum (Al) toxicity is the major factor limiting crop productivity in acid soils. In this study, a recombinant inbreed line (RIL) population derived from a cross between an A1 sensitive lowland indica rice variety IR1552 and an Al tolerant upland japonica rice variety Azucena, was used for mapping quantitative trait loci (QTLs) for A1 tolerance. Three QTLs for relative root length (RRL) were detected on chromosome 1, 9, 12, respectively, and I QTL for root length under Al stress is identical on chromosome I after one week and two weeks stress. Comparison of QTLs on chromosome 1 from different studies indicated an identical interval between C86 and RZ801 with gene(s) for Al tolerance. This interval provides an important start point for isolating genes responsible for A1 tolerance and understanding the genetic nature of Al tolerance in rice. Four Al induced ESTs located in this interval were screened by reverse Northern analysis and confirmed by Northern analysis. They would be candidate genes for the QTL. 相似文献
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Comparative mapping of QTLs for Al tolerance in rice and identification of positional Al-induced genes 总被引：2，自引：0，他引：2
INTRODUCTION Aluminum (Al) toxicity is one of the mostimportant yield-limiting factors for crop grown onacid upland and lowland acid sulphate soils (IRRI,1978). Al toxicity results in a reduced and damagedroot system, which in turn causes the affectedplants to be susceptible to drought stress and min-eral nutrient deficiencies (Foy, 1988). The physio-logical and biochemical mechanisms of the toxiceffect of Al on root elongation had been extensivelyinvestigated (Matsumoto, 2000). T… 相似文献
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INTRODUCTIONOryzasativaL .riceisasemi aquaticspe ciesadaptedtoavarietyofclimates.Uplandricedependsmainlyonrainfall,isoftenexposedtodrought,andhasdevelopeddroughtresistanttraits.Aprincipalmechanismbywhichriceadaptstowaterdeficiencyisthroughtheposses sionof… 相似文献
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