A field trial was conducted to investigate the changes of endogenous hormone concentration （EHC） during formation and thickening of tuberous roots in sweet potato （Ipomoea batatas L.） of different genotypes： Xush...A field trial was conducted to investigate the changes of endogenous hormone concentration （EHC） during formation and thickening of tuberous roots in sweet potato （Ipomoea batatas L.） of different genotypes： Xushu 18, Minamiyutaka, and L trifida-K123. The results of this study 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 concentration of ABA, ZR, and DHZR at 1 or 5% significant level, but were not obviously correlated with the concentrations of IAA, IPA, and GA4. The concentrations of ABA, ZR and DHZR played very important roles in the tuberous root formation and thickening in sweet potato. The concentrations of ZR, DHZR, ABA, and IAA in the upper or inner portion of tuberous roots were significantly higher than those toward the end of the root or its outer portion. Meanwhile, EHC of large-sized tuberous roots were significantly higher than those of medium- or small-sized tubers during the early thickening period. In the rapid thickening period of tuberous roots, EHC of medium-sized tubers were the highest, However, at the late-thickening period, EHC of small-sized tubers ranked the highest.展开更多
Potato grows in most part of China, it achieves higher yield and better quality in Gansu Province than in others. With global warming, its growth duration has been prolonged and sowing date become earlier than before....Potato grows in most part of China, it achieves higher yield and better quality in Gansu Province than in others. With global warming, its growth duration has been prolonged and sowing date become earlier than before. Therefore, to regulate its sowing date and growing period is of great significance for better harvest. In this study, experiments were conducted with six sowing-date treatments of potato in Dingxi, which is in the Loess Plateau of central Gansu Province in Northwest China in 2010. The growth period, morphological index and change in yield and their relationships with temperature, precipitation, and other climatic factors were investigated for each treatment. Results show that the crop with different sowing dates experienced different climate conditions, leading to distinct growth duration, plant height, and leaf area index. The growth duration was shortened due to a delay in sowing date. For each 15-day delay in sowing, the growth duration was reduced by 12 days on average. A significant linear relationship was found between numbers of days either from seeding to emergence or from flowering to harvest and mean temperature over the corresponding period. Dry matter accumulation, tuber fresh weight, and final yield were all decreased because of insufficient cumulative temperature over the shorter growing periods. Marked differences in tuber yield were discovered among the six treatments of sowing date, the potato planted on May 27 giving the highest yield. The potato planted either earlier or later would produce invariably lower yield than the treatment of May 27. Late May therefore can be taken as the optimum sowing time of potato in this region because the crop can fully utilize thermal resource. We conclude that to postpone sowing time is a good practice for potato production to adapt to climate warming in the Loess Plateau of central Gansu, China.展开更多
马铃薯块茎形成机理不仅是植物发育生物学研究的重要内容之一,也是提高马铃薯产量、品质的重要保障。早期研究发现,光周期是诱导马铃薯块茎形成的一个关键环境因子,短日照利于马铃薯块茎形成。近10多年来,光周期调控马铃薯块茎形成机理...马铃薯块茎形成机理不仅是植物发育生物学研究的重要内容之一,也是提高马铃薯产量、品质的重要保障。早期研究发现,光周期是诱导马铃薯块茎形成的一个关键环境因子,短日照利于马铃薯块茎形成。近10多年来,光周期调控马铃薯块茎形成机理研究取得了重要进展。已有研究发现,马铃薯块茎形成与拟南芥等植物的开花过程有较多相似之处。大量参与植物开花的重要基因,如光敏色素、CONSTANS(CO)、FLOWERING LOCUS T(FT)、LOV蓝光受体蛋白家族及CDF转录因子等在马铃薯块茎形成过程中都起到重要的调控作用。此外,马铃薯中发现的同源异型框基因POTH1及其相互作用基因StBEL5也在光调控马铃薯块茎形成过程中扮演重要角色。本文主要从马铃薯光信号感知及与光周期信号传递有关的基因调控等领域综述了光周期诱导的马铃薯块茎形成最新研究进展。展开更多
文摘A field trial was conducted to investigate the changes of endogenous hormone concentration （EHC） during formation and thickening of tuberous roots in sweet potato （Ipomoea batatas L.） of different genotypes： Xushu 18, Minamiyutaka, and L trifida-K123. The results of this study 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 concentration of ABA, ZR, and DHZR at 1 or 5% significant level, but were not obviously correlated with the concentrations of IAA, IPA, and GA4. The concentrations of ABA, ZR and DHZR played very important roles in the tuberous root formation and thickening in sweet potato. The concentrations of ZR, DHZR, ABA, and IAA in the upper or inner portion of tuberous roots were significantly higher than those toward the end of the root or its outer portion. Meanwhile, EHC of large-sized tuberous roots were significantly higher than those of medium- or small-sized tubers during the early thickening period. In the rapid thickening period of tuberous roots, EHC of medium-sized tubers were the highest, However, at the late-thickening period, EHC of small-sized tubers ranked the highest.
基金supported by the Scientific Research and Innovation Plan for College Graduates of Jiangsu Province, China(CXZZ13_0521)
文摘Potato grows in most part of China, it achieves higher yield and better quality in Gansu Province than in others. With global warming, its growth duration has been prolonged and sowing date become earlier than before. Therefore, to regulate its sowing date and growing period is of great significance for better harvest. In this study, experiments were conducted with six sowing-date treatments of potato in Dingxi, which is in the Loess Plateau of central Gansu Province in Northwest China in 2010. The growth period, morphological index and change in yield and their relationships with temperature, precipitation, and other climatic factors were investigated for each treatment. Results show that the crop with different sowing dates experienced different climate conditions, leading to distinct growth duration, plant height, and leaf area index. The growth duration was shortened due to a delay in sowing date. For each 15-day delay in sowing, the growth duration was reduced by 12 days on average. A significant linear relationship was found between numbers of days either from seeding to emergence or from flowering to harvest and mean temperature over the corresponding period. Dry matter accumulation, tuber fresh weight, and final yield were all decreased because of insufficient cumulative temperature over the shorter growing periods. Marked differences in tuber yield were discovered among the six treatments of sowing date, the potato planted on May 27 giving the highest yield. The potato planted either earlier or later would produce invariably lower yield than the treatment of May 27. Late May therefore can be taken as the optimum sowing time of potato in this region because the crop can fully utilize thermal resource. We conclude that to postpone sowing time is a good practice for potato production to adapt to climate warming in the Loess Plateau of central Gansu, China.
文摘马铃薯块茎形成机理不仅是植物发育生物学研究的重要内容之一,也是提高马铃薯产量、品质的重要保障。早期研究发现,光周期是诱导马铃薯块茎形成的一个关键环境因子,短日照利于马铃薯块茎形成。近10多年来,光周期调控马铃薯块茎形成机理研究取得了重要进展。已有研究发现,马铃薯块茎形成与拟南芥等植物的开花过程有较多相似之处。大量参与植物开花的重要基因,如光敏色素、CONSTANS(CO)、FLOWERING LOCUS T(FT)、LOV蓝光受体蛋白家族及CDF转录因子等在马铃薯块茎形成过程中都起到重要的调控作用。此外,马铃薯中发现的同源异型框基因POTH1及其相互作用基因StBEL5也在光调控马铃薯块茎形成过程中扮演重要角色。本文主要从马铃薯光信号感知及与光周期信号传递有关的基因调控等领域综述了光周期诱导的马铃薯块茎形成最新研究进展。
