共查询到19条相似文献,搜索用时 625 毫秒
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NAC转录因子是植物中最大的特异性转录因子家族之一,其依赖由高度保守的N端结构域和高度变异的C端转录调控结构域组成独特的NAC结构域发挥功能,在果实成熟的调控中发挥着重要的作用。在介绍NAC转录因子的结构特征及不同物种NAC基因的成员与分类的基础上,总结了近年来NAC转录因子在果实成熟过程中的积极作用,包括促进果实软化影响果实质地,促进叶绿素降解及类胡萝卜素、类黄酮和花色苷的合成决定果实着色、调控糖分积累影响果实糖酸比例以及促进多种芳香化合物合成积累形成果实特有风味、果实脱涩等方面,并阐述了NAC转录因子与内源激素特别是乙烯和ABA交互在调控果实成熟中的重要作用。总结了NAC转录因子调控果实成熟的潜在机制以及影响NAC表达的因素与分子通路,旨在为在果实成熟性状遗传改良与调控技术研发提供重要参考。 相似文献
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[目的]研究NAC转录因子FaNAC56在草莓果实成熟中的作用.[方法]根据前期果实成熟过程中的蛋白组数据,以八倍体红颜草莓为试材,克隆FaNAC56基因及其启动子.在蛋白水平,利用MEGA构建FaNAC56系统进化树,并通过生物信息学预测其编码蛋白的二级结构,以及利用烟草进行亚细胞定位;在转录调控水平,利用预测网站分析FaNAC56启动子区顺式作用元件以及下游靶基因,并通过RT-qPCR分析FaNAC56的时空表达模式.最后,利用果实圆片温育方法分析FaNAC56基因受外源激素诱导情况.[结果]FaNAC56基因全长1035 bp,编码344个氨基酸,具有NAC转录因子NAM保守结构域.系统发育分析表明FaNAC56与月季NAC56同源性最高.亚细胞定位显示FaNAC56定位于细胞核内.FaNAC56在果实中高度表达并随果实成熟表达量急剧增加.FFaNAC56启动子区含有ABA、赤霉素、生长素、乙烯等激素和胁迫相关响应元件,其表达水平受这些激素诱导.靶基因分析发现FaNAC56可能响应多种激素、花色苷和蔗糖调控元件.[结论]FaNAC56可能通过多种激素调控草莓果实的发育和成熟. 相似文献
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肉果是人类饮食中必不可少的一部分,研究肉果成熟和发育的转录调控机制具有重要意义,将为果实品质改良奠定基础。文章首先介绍了肉果早期发育阶段和成熟过程的转录调控,以及乙烯作为一种重要激素在肉果成熟转录调控中的作用。番茄作为研究肉果成熟转录调控的模式植物具有很多优点,重点概述了番茄成熟的转录调控网络和转录因子的作用目标分子,指出MADS(MCM1 AGAMOUS DEFICIENS SRF)域蛋白FUL(FRUITFULL)、RIN(RIPENINGINHIBITOR)、AP2a(APETALA2a)和TAGL1(TOMATO AGAMOUS-LIKE1)等转录因子在番茄果实发育和成熟转录调控中的重要作用。 相似文献
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脱落酸(ABA)促进果实着色研究进展 总被引:2,自引:0,他引:2
着色状况是衡量果实成熟程度和质量优劣的重要评价指标。影响果实着色的因素诸多,其中生长调节物质是影响果实着色的因素之一,笔者对生长调节物质脱落酸(abscisic acid,ABA)影响果实着色的研究进行综述,主要包括ABA影响葡萄、草莓、苹果、桃等果实着色的作用时间、浓度及分子生物学机制,从生理和分子水平阐述ABA促进果实着色机制。详细综述了外源ABA对内源乙烯、ABA等激素的含量及其之间平衡的影响,以及对花色苷合成途径中关键基因和转录因子的影响。旨在通过归纳ABA促进果实着色的研究报道,为外源生长调节物质以及植物内源激素的研究提供参考,为果树高效生产奠定理论基础。 相似文献
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果实中脱落酸的研究进展与展望 总被引:1,自引:0,他引:1
综述了果实中脱落酸(abscisic acid,ABA)的生理作用、代谢及信号转导的研究进展,并提出了果实中ABA从产生到作用的分子机制。果实中ABA的积累主要受4种关键酶的调控,包括NCEDs、CYP707As、GTs和BGs。在果实成熟过程中,ABA信号的启动是通过PYRs等受体蛋白感知,并通过ABI1和SnRK2等蛋白的可逆磷酸化作用将信号传递给下游转录因子和顺式元件,最终促发果实软化、糖分积累及着色等成熟相关基因的表达。进一步深入研究ABA调控果实成熟的信号转导分子机制及ABA、糖和乙烯交叉调控网络是未来重要的研究领域。 相似文献
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《果树学报》2019,(11)
【目的】番木瓜是典型的呼吸跃变型果实,外源乙烯处理使番木瓜呼吸跃变提前,促进果实成熟。分离番木瓜果实成熟相关miRNA,为深入了解呼吸跃变型果实的成熟分子机制奠定基础。【方法】利用高通量测序技术对乙烯(ETH)、1-MCP和清水对照(CG)处理的番木瓜果实进行miRNA和转录组高通量测序,然后对测序获得数据进行生物信息学分析,进行miRNA鉴定和靶基因预测,并与转录组测序结果进行关联分析。【结果】乙烯、1-MCP和对照处理分别获得10 734 196、16 486 803和16 067 290条纯净序列,共鉴定出523个miRNA。其中,已知miRNA个数为1-MCP(303)、CG(214)和ETH(239),新miRNA个数为1-MCP(184)、CG(188)和ETH(114)。与对照相比,在乙烯处理中上调和下调表达的miRNA分别是123和72条。靶基因预测共获得5 053个靶基因,KEGG功能富集分析显示它们参与了戊糖、葡萄糖醛酸转换、淀粉和蔗糖代谢、卟啉和叶绿素代谢、类胡萝卜素合成等代谢途径。筛选出的番木瓜果实成熟衰老相关候选miRNA,包含4个果实软化调控相关miRNA(miR167-y、miR4993-x、miR3946-x和miR5059-x)、3个果实颜色调控相关miRNA(miR4993-x、miR815-y和miR7810-x)、3个激素调控相关miRNA(miR4993-x、miR8004-x和miR9722-x)和4个转录因子调控相关miRNA(miR5641-y、miR9722-x、miR838-y和miR319-y)。【结论】筛选的番木瓜果实成熟衰老相关miRNA为今后果实成熟衰老调控网络研究提供了可能的线索。 相似文献
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植物激素与柿子后熟的关系 总被引:25,自引:0,他引:25
研究了柿子后熟期内源激素的变化和外源激素的影响。结果表明,柿子的后熟取决于乙烯和脱落酸(ABA)的协同作用,尤其在ABA的作用更重要;而各种内源激素的平衡又影响果实对ABA和乙烯的敏感性。越不耐藏的柿子品种,对ABA和乙烯的忍耐性越差,二者在低浓度下限诱发后熟变化,其后期乙烯峰越高,ABA累积越多。外源ABA和乙烯可提高果内乙烯浓度和呼吸强度,加速果实后熟软化;GA和苄基基腺嘌呤(BA)处理可减小 相似文献
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香蕉MaTIFY1转录因子特性及其在成熟过程中基因表达分析 总被引:1,自引:0,他引:1
从香蕉果实中分离获得1个TIFY亚族的转录因子基因,命名为MaTIFY1。该基因含有一个681 bp的ORF,编码一条长度为227 aa,分子量为24.97 kD,等电点为7.85的氨基酸多肽链。MaTIFY1定位于细胞核,并且具有转录激活活性。荧光定量PCR分析表明,MaTIFY1随着香蕉果实成熟进程表达明显增强,并且外源丙烯处理可诱导其表达。此外,MaTIFY1启动子活性受乙烯利诱导激活,进一步表明MaTIFY1可能参与香蕉果实成熟的调控。原核表达并纯化了MaTIFY1重组蛋白。 相似文献
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乙烯调控非跃变型果实成熟衰老研究进展 总被引:6,自引:0,他引:6
非跃变型果实成熟衰老过程产生的乙烯远低于跃变型果实,20世纪70年代以来,乙烯被认为在非跃变型果实成熟衰老中发挥的作用非常有限。然而,由于该类型包含许多重要经济价值的果实,如柑橘、草莓、葡萄、枇杷等,近年来乙烯参与非跃变型果实成熟衰老相关研究陆续有报道。大量结果明确表明,非跃变型果实诸多成熟相关过程也直接受乙烯调控,且非跃变型果实和跃变型果实品质变化的某些分子调控途径非常相似。本文中主要综述了乙烯调控非跃变型果实成熟衰老研究进展。 相似文献
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Defense response of tomato fruit at different maturity stages to salicylic acid and ethephon 总被引:1,自引:0,他引:1
In order to elucidate whether fruit maturity stage influence the induced resistance of exogenous elicitors in tomato and the involved mechanisms, we investigated the defense responses of tomato fruits against Botrytis cinerea, ethylene production and internal quality following treatments of fruit with salicylic acid (SA) or ethephon (ET) at mature green (MG) and breaker (BR). SA significantly suppressed decay and disease incidence in tomato fruits at both MG and BR stages, along with higher expression level of PR1 gene after 2 days of treatment. All fruits treated by SA had lower contents of ethylene and lycopene. The ET-treated fruit at both maturity stages showed lower disease incidence and higher level of PR2 and PR3 expression compared with the control fruit. ET treatment significantly enhanced ethylene and lycopene contents, and accelerated fruit ripening. Our results suggest that SA and ET induced disease resistance in fruits by mediating the expression of different pathogenesis-related genes and have different effects on fruit ripening, which in turn influences the disease resistance of tomato fruits. 相似文献
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J. G. M. Cutting B. N. Wolstenholme 《The Journal of Horticultural Science and Biotechnology》2013,88(4):569-575
The influence of cold storage, increasing fruit maturity and water loss on the ripening physiology of ‘Fuerte’ avocado was investigated. Fruit cold stored for 28 d at 5.5°C always subsequently ripened faster than non-stored fruits of a similar maturity. Non-stored fruit showed an expected decrease in ripening time with increasing maturity. In cold stored fruit the relationship between ripening time and maturity was less clear. Cold stored fruit lost less water during ripening than non-stored fruit of similar maturity, but lost water faster than non-stored fruit. Increasing maturity reduced the total amount of water lost during ripening. Cold storage increased the incidence of mesocarp discoloration which became more severe with increasing fruit maturity. Passive water infusion into fruit had no effect on the rate of fruit ripening (and water is obviously not involved as a ‘ripening trigger’) but totally inhibited the manifestation of postharvest browning disorders. 相似文献
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‘d'Anjou’ pear fruit, harvested at optimum maturity with flesh firmness of 6.8 kg, were stored at ?1.1°C. Fruit were ripened at 20°C for 15 days following storage for 1–8 months. Dessert qualities were evaluated organoleptically on Day 10 of each ripening period. Changes in fruit firmness, extractable juice, titratable acids, solubl solids, respiration, ethylene production and internal ethylene were determined daily during each ripening period. Fruit firmness declined continually from 6.8 kg at harvest to 4.5 kg after 8 months of storage. Fruit stored for 2–8 months softened with a similar pattern during a 15-day ripening period at 20°C, while fruit stored for 1 month softened at a slower rate during ripening to 3.2 kg, with a coarse and dry texture after 15 days at 20°C. Fruit stored for 2–4 months ripened with the desirable buttery and juicy texture, while those stored for more than 5 months ripened with a coarse or mealy and dry texture. The buttery and juicy texture was highly correlated with a lower extractable juice, which could be used for quantitative determination of storage life based on ripened fruit quality. Changes in titratable acids and soluble solids during each ripening period were not associated with changes in dessert qualities of the ripened pears. Rates of respiration, ethylene production and internal ethylene during ripening at 20°C varied with duration of storage, but were not associated with changes in dessert qualities of the ripened fruit. 相似文献