Temperature effects on cytokinin accumulation and kernel mass in a dwarf wheat
Temperature effects on cytokinin accumulation and kernel mass in a dwarf wheat
复制标题
DOI：
10.1006/anbo.1998.0823
复制
发表时间：
1999-03-01
期刊：
影响因子：
4.2
通讯作者：
Chen, DD
中科院分区：
文献类型：
--
作者：
Banowetz, GM;Ammar, K;Chen, DD
本研究的目的是：(1)定量测定矮秆小麦‘西藏矮秆’开花后籽粒细胞分裂素的含量。这将积累更多的叶片细胞分裂素；以及(2)测量温度对这种小麦籽粒细胞分裂素积累和成熟籽粒质量的影响。在对照植株和处理植株中测量了花后籽粒细胞分裂素的积累，对照植株从开花时开始接受35/25℃的7d暴露，并在25/15℃成熟。在对照和处理植株中检测到的主要细胞分裂素是玉米素(Z)、二氢玉米素(DiHZ)及其各自的核苷。检测到极少量的异戊烯基腺嘌呤类细胞分裂素。两组花后3d籽粒细胞分裂素含量均达到峰值，1~2d恢复到基线水平，高温处理降低了籽粒细胞分裂素含量。80%在花后1d内。由于对照西藏矮秆植株的籽粒细胞分裂素含量比以前测定的其他品种高出100多倍，所以处理植株的含量仍然超过了其他品种的未处理植株。细胞分裂素含量的增加并没有提高耐热性。温度处理使成熟籽粒重量降低了约30%。27%，与其他小麦品种的降幅相似。(C)1999年植物学公司年鉴。
The objectives of this study were: (I) to quantify post-anthesis kernel cytokinin levels in 'Tibet Dwarf', a dwarf wheat (Triticum aestivum L.) that accumulates elevated quantities of leaf cytokinins; and (2) to measure the effects of temperature on kernel cytokinin accumulation and mature kernel mass in this wheat. Post-anthesis kernel cytokinin accumulation was measured in control plants maintained at 25/12 degrees C (day/night) and treated plants which received a 7 d exposure to 35/25 degrees C beginning at anthesis and grown to maturity at 25/15 degrees C. Zeatin (Z), dihydrozeatin (diHZ) and their respective ribosides were the predominant cytokinins detected in control and treated plants. Minimal quantities of isopentenyl adenine-type cytokinins were detected. Kernel cytokinin content peaked within 3 d after anthesis in both groups and returned to baseline levels within 1-2 d. Relative to controls, exposure to high temperature reduced kernel cytokinin content approx. 80% within I d after anthesis. Because kernel cytokinin in control Tibet Dwarf plants exceeded that previously measured in other varieties by over 100-fold, the reduced content of treated plants still exceeded that of untreated plants of other varieties. The increased cytokinin content did not enhance thermotolerance. The temperature treatment reduced mature kernel weights approx. 27%, similar to reductions measured in other wheat varieties. (C) 1999 Annals of Botany Company.