Interactions of Temperature and Photoperiod Determine Expression of Repeat Flowering in Strawberry
Interactions of Temperature and Photoperiod Determine Expression of Repeat Flowering in Strawberry
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DOI：
10.21273/jashs.135.2.102
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发表时间：
2010-03-01
影响因子：
1.9
通讯作者：
Warner, Ryan M.
中科院分区：
文献类型：
--
作者：
Bradford, Emma;Hancock, James F.;Warner, Ryan M.
草莓（Fragaria x ananassa）品种在重复开花或重复开花的表达上差异很大。为了更明确地定义温度和日照长度在草莓开花控制中的作用，研究了非抗性品种蜜眼（honeyye）和两种抗性基因型——日中性品种“贡贡”（Tribute）和优良克隆Fragaria virginia ssp。分别在14、17、20、23、26或29℃下，在短（9小时）或长（16小时）光周期下生长。不同温度和光周期处理下基因型开花响应的差异主要是由于以下因素的差异：1)开花光周期不敏感的允许温度范围；2)超过光周期不敏感范围时的光周期需求；3)腋窝分生组织的发育速度。“蜜眼”的光周期不敏感温度范围从14摄氏度到20摄氏度不等，RH 30为23摄氏度，“贡品”为26摄氏度。当温度超过光周期不敏感范围时，“蜜眼”和RH 30需要较短的开花天数，而“贡”需要较长的开花天数。在开花处理中，“蜂蜜眼”的开花时间比“贡品”和RH 30晚了约84天。这些结果表明，温度和花的起始/发育速率强烈影响抗性的表达，仅筛选日中性基因型不太可能产生抗性强的品种。
Strawberry (Fragaria x ananassa) cultivars vary greatly in the expression of remontancy, or repeat flowering. To more clearly define the roles of temperature and daylength in flowering control of strawberry, the non-remontant cultivar Honeoye, and two remontant genotypes classified as day-neutral, 'Tribute' and an elite clone of Fragaria virginiana ssp. virginiana, RH 30, were grown at 14, 17, 20, 23, 26, or 29 degrees C, under a short (9 h) or long (16 h) photoperiod. Differential flowering responses of genotypes across temperature and photoperiod treatments resulted from variation in 1) the photoperiod-insensitive permissive temperature range for flowering, 2) photoperiodic requirement if temperature exceeded the photoperiod-insensitive range, and 3) the rate of development of axillary meristems. The photoperiod-insensitive temperature range varied from 14 up to 20 degrees C for 'Honeoye', 23 degrees C for RH 30, and 26 degrees C for 'Tribute'. When temperature exceeded the photoperiod-insensitive range, 'Honeoye' and RH 30 required short days for flowering, while 'Tribute' required long days. Flowering of 'Honeoye' lagged behind 'Tribute' and RH 30 by about 84 days in treatments where flowering occurred. These results indicate that temperature and floral initiation/development rate strongly influence the expression of remontancy, and that screening genotypes for day neutrality alone is unlikely to result in the development of robustly remontant cultivars.