共查询到17条相似文献,搜索用时 234 毫秒
1.
2.
光调控植物叶绿素生物合成的研究进展 总被引:1,自引:0,他引:1
《园艺学报》2019,(5)
总结了光信号(光强、光质、光周期及昼夜节律中光暗变化)对叶绿素含量及其生物合成途径中相关基因的影响。重点归纳了光信号途径中主要转录因子对叶绿素合成基因的调控机制,强调了表观遗传修饰在光调控叶绿素合成中的重要作用,以期探索光调控叶绿素积累的有效途径及靶标分子,为利用基因工程和环境调控手段定向调控有重要生物学功能的叶绿素提供理论基础。 相似文献
3.
4.
成花转换是被子植物生活周期中的关键发育过程,植物通过调控基因表达模式而整合多条内外开花信号实现成花诱导。近几十年来,学者们为阐释植物成花转换的分子机制做了大量的分子遗传学研究。其中,影响植物生长发育的表观遗传修饰是调控成花转换过程的重要分子机制之一。表观遗传调控是植物在适宜环境条件下实现开花诱导和花器官发育的决定性因素。综述了有关开花时间和花器官发育的表观遗传学研究进展,包括染色质重塑、组蛋白甲基化和miRNAs。 相似文献
5.
6.
7.
FLOWERING LOCUS C(FLC)是植物抽薹开花调控网络中关键的开花决定因子。随着表观遗传学的发展,人们发现组蛋白修饰等表观调控FLC 的表达在植物抽薹开花时间调控中起着非常重要的作用。FLC 的抑制因子或促进因子通过改变组蛋白氨基酸的共价修饰(如乙酰化、甲基化等),影响FLC基因所在区域的染色质重塑,调控FLC 转录表达水平,从而调节植物抽薹开花。本文就近年来国内外对植物抽薹开花关键调控基因FLC 及表观遗传调控其表达研究现状进行了综述,并针对目前研究中存在的问题提出了今后的研究方向和重点。 相似文献
8.
9.
10.
综述了整合态香蕉线条病毒的相关研究进展,重点介绍了整合态香蕉线条病毒的同源重组游离机制、主要由基因遗传和表观遗传等介导的调控机制及其生物学意义,并对整合态病毒研究进行了展望,以期为研究香蕉和香蕉线条病毒共同进化及互作提供参考依据。 相似文献
11.
12.
13.
14.
石竹试管花的诱导及其影响因子的研究 总被引:15,自引:3,他引:12
以石竹试管花的茎段为材料,研究了几种因子对试管花形成的作用。结果表明,开花植株的茎段可稳定地保持形成花芽的能力;外源激素对试管花的形成不是必需的因子。低浓度的生长素利于长根,对花芽的形成没有明显的影响,但较高浓度明显地抑制试管花的形成;细胞分裂素只促进营养芽的分化,完全抑制花芽的形成;所试培养基的各类和浓度除N6培养基外对花芽的作用没明显的差异;在缺NH4NO3的培养基中植株的营养生长受到抑制,植株变矮,叶片数减少,基部叶片发黄,植株提前开花,但不影响开花率。植株上部茎段比下部茎段形成花芽的频率高。 相似文献
15.
通过分析不同营养配比和pH值处理万寿菊水培液的开花情况,试验得出,增施磷肥对万寿菊开花的影响较小;配施磷钾肥主要影响万寿菊的单株花朵数和花型大小;而配施钾肥对万寿菊的花期、单株花朵数和花型大小均有较好的影响。万寿菊开花较适宜的水培条件是pH值6.5,即弱酸到中性的环境。此时万寿菊的花期较长、花型较大、单株花朵数较多,花的颜色也最靓丽。 相似文献
16.
O. M. Heide 《The Journal of Horticultural Science and Biotechnology》2013,88(4):267-284
The effect of plant age, temperature and day-length on flower initiation and development in “ K. & M. Super ” freesias has been studied.The flowering response decreased with increasing temperature and the critical temperature for flower initiation was found to be about 21°C. An interaction of plant age, temperature, and duration of treatment was present. Short days (9 hrs.) slightly stimulated flower initiation in“ Yellow K. & M. Super” but delayed it in “ Blue K. & M. Super” freesias. Short-day treatment in the open during the summer had no significant effect, whereas shading markedly hastened flowering.Flowering could be initiated at an early stage, but older plants were more responsive, especially those of “Blue K. & M. Super”. Optimum temperatures for flower initiation were 12-15°C., applied for 6-9 weeks after the plants had formed about seven visible leaves.Abnormal inflorescences in freesias, recognized by enlarged bracts and irregular spacing of the florets (so-called “gladiolus-like flowers”), appeared to result from incomplete flower initiation. In extreme cases flower stalks without any flowers were formed. In order to avoid such abnormal flowering it was important that the first floret in the inflorescence should have reached a certain stage (P2) of development before low-temperature treatment was discontinued. 相似文献
17.
S.J. Wellensiek 《Scientia Horticulturae》1973,1(1):77-83
Weekly growth analyses were made of a very late flowering pea line (‘L’) and its medium flowering (‘M’) and early flowering (‘E’) mutants, grown at three photoperiods.The number of stem nodes of young vegetative plants is not affected by the genotype (L, M, E) nor by the day length. In older plants node numbers tend to increase with the day length, but the rate of node formation decreases with flower formation.Internode length is also independent of genotype, but it increases with day length, even in very young plants, and shows a further considerable increase when flower formation starts.Hence, flower formation clearly marks changes in the growth pattern, consisting of a decrease in node formation and an increase in internode length. These effects are primarily brought about by the genes which determine the rate of flower formation. 相似文献