Responses of ABA and CTK to soil drought in leafless and leafy apple tree |
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Authors: | Li?Yan Pan?Hai-chun Email author" target="_blank">Li?De-quanEmail author |
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Institution: | (1) Department of Horticulture, Zhejiang University, 310029 Hangzhou, China;(2) Department of Plant Sciences, Shandong Agricultural University, 271018, Taian, China |
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Abstract: | The authors tested the contents of ABA (abscisic acid), ZR (zeatin riboside), DHZR (dihydrozeatin riboside) and iPA (isopentenyl
adenosine) in leafless and leafy apple trees (Red Fuji/Malus micromalus Makino) during soil drought stress. ABA concentration in drought stressed leafless trees increased significantly compared to the
controls. ABA both in roots and xylem rose steadily in the earlier drought stage, reaching a maximum of 1.46±0.35 nmol g−1 FW and 117 nmol l−1 after the 8th day. Similar change patterns of ABA concentration was observed in the leafy trees during soil drought stress;
ABA concentrations in roots and xylem sap increased and reached the maximum in the first three days; after 8th day, it decreased
slightly, whereas leaf ABA concentration increased steadily in drought stressed plants throughout the duration of the experiment.
Between drought stressed and control trees, no significant differences were observed in concentration of ZR and DHZR in both
leafless and leafy trees; whereas iPA concentration of the drought stressed leafless and leafy plants decreased markedly in
the later stage of drought. These results showed that endogenous ABA originated mainly from the roots in the earlier drought
stage, and mainly from the leaves in the later drought stage. Total CTK showed no reduction in the earlier drought stage and
decreased in the later drought stage.
Project supported the National Natural Science Foundation of China (No. 39870526) and the National Key Basic Research Special
Foundation of China (G1999011700) |
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Keywords: | Apple tree Endogenous hormone Soil drought Relative water content Water potential |
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