Formation and Thickening of Tuberous Roots in Relation to the Endogenous Hormone Concentrations in Sweetpotato
Formation and Thickening of Tuberous Roots in Relation to the Endogenous Hormone Concentrations in Sweetpotato
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发表时间：
2005
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通讯作者：
Wang Qing-mei
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作者：
Wang Qing-mei
通过田间试验，研究了不同基因型（徐薯18号、南久高和I .trifida- k123）甘薯块根形成和增粗过程中内源激素浓度的变化。结果表明，苏树18和南宫高的玉米蛋白核苷（ZR）、二氢玉米蛋白核苷（DHZR）、脱落酸（ABA）、吲哚-3-乙酸（IAA）和异戊基腺嘌呤（IPA）含量显著高于三叶草- k123。干块根产量与ABA、ZR和DHZR浓度呈1%或5%显著正相关，与IAA、IPA和GA4浓度无显著相关。ABA、ZR和DHZR浓度对甘薯块根的形成和增粗有重要影响。根尖和根内ZR、DHZR、ABA和IAA含量均显著高于根尖和根外。粗化早期，大块根内源激素浓度显著高于中块根和小块根。在块根快速增厚期，中块茎内源激素浓度最高。但在增厚后期，小块茎内源激素浓度最高。
A field trial was conducted to investigate the changes of endogenous hormone concentration during formation and thickening of tuberous roots in sweetpotato (Ipomoea batatas L.) of different genotypes (Xushu 18, Minamiyutaka and I .trifida-K123). The present results suggested that the concentrations of zeatin riboside (ZR), dihydro-zeatin riboside (DHZR), abscisic acid (ABA), indole-3-acetic acid (IAA) and isopentenyl-adenine (IPA) of Xushu 18 and Minamiyutaka were significantly higher than those of I.trifida-K123. Dry tuberous root yields were positively correlated with the concentrations of ABA, ZR and DHZR at 1% or 5% significant level, but not correlated with the concentrations of IAA, IPA and GA4. The concentrations of ABA, ZR and DHZR played very important roles for the tuberous roots formation and thickening in sweetpotato. The concentrations of ZR, DHZR, ABA and IAA in the top or inner parts of tuberous roots were significantly higher than those of in the end or outer parts. Meanwhile, endogenous hormone concentrations of big tuberous roots were significantly higher than that of middle or small ones at early thickening period. In fast thickening period of tuberous roots, endogenous hormone concentrations of middle tubers were the highest. However, at late thickening period, endogenous hormone concentrations of small tubers ranked the highest.