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Author Wang H., Wu Z., Han J., Zheng W., Yang C.
Title Comparison of ion balance and nitrogen metabolism in old and young leaves of alkali-stressed rice plants.
Abstract:
Alkali stress is an important agricultural contaminant and has complex effects on plant metabolism. The aim of this study was to investigate whether the alkali stress has different effects on the growth, ion balance, and nitrogen metabolism in old and young leaves of rice plants, and to compare functions of both organs in alkali tolerance. The results showed that alkali stress only produced a small effect on the growth of young leaves, whereas strongly damaged old leaves. Rice protected young leaves from ion harm via the large accumulation of Na(+) and Cl(-) in old leaves. The up-regulation of OsHKT1;1, OsAKT1, OsHAK1, OsHAK7, OsHAK10 and OsHAK16 may contribute to the larger accumulation of Na(+) in old leaves under alkali stress. Alkali stress mightily reduced the NO(3)(-) contents in both organs. As old leaf cells have larger vacuole, under alkali stress these scarce NO(3)(-) was principally stored in old leaves. Accordingly, the expression of OsNRT1;1 and OsNRT1;2 in old leaves was up-regulated by alkali stress, revealing that the two genes might contribute to the accumulation of NO(3)(-) in old leaves. NO(3)(-) deficiency in young leaves under alkali stress might induce the reduction in OsNR1 expression and the subsequent lacking of NH(4)(+), which might be main reason for the larger down-regulation of OsFd-GOGAT and OsGS2 in young leaves. Our results strongly indicated that, during adaptation of rice to alkali stress, young and old leaves have distinct mechanisms of ion balance and nitrogen metabolism regulation. We propose that the comparative studies of young and old tissues may be important for abiotic stress tolerance research.
Journal PLoS ONE
Country China
Volume 7(5)
Pages e37817
Year 2012
PubMed ID 22655071
PubMed Central ID 3360002
DOI -
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Relation
Gene ABC1 AKT1 AMT1;1 AMT1;2 AMT1;3 AMT2;1 AMT2;2 AMT2;3 AMT3;1 AMT3;2 AMT3;3 ASN GDH1 GDH2 GDH3 GLN1;1 GLN1;2 GLN1;3 GLT1 GLT2 GS2 HAK10 HAK16 HAK4 HAK7 HKT1 HKT4 HKT6 HTNE LCS NHX1 NHX3 NRT1 PSR1 PTR6 SKC1 SOS1 SOS2 SOS3 _
INSD -
Strain Wild Core Collection -
Induced Mutation Lines(NIG Collection) -
Sterile Seed Strain -
Lethal Embryo
Mutantion Strain
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Stages in Each Organ
- Muant Lines (Gene)
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Cultivated Varieties(NIG Collection) -
Stages in Each Organ -
/rice/oryzabase