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首页> 外文期刊>Journal of Experimental Botany >Increased CiFT abundance in the stem correlates with floral induction by low temperature in Satsuma mandarin (Citrus unshiu Marc.).
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Increased CiFT abundance in the stem correlates with floral induction by low temperature in Satsuma mandarin (Citrus unshiu Marc.).

机译：萨摩普通话（Citrus unshiu Marc。）的茎中CiFT丰度增加与低温诱导的花诱导有关。

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摘要

After several years in the juvenile phase, adult citrus trees show seasonal periodicity of flowering. A prolonged exposure to low temperature is one of the most important environmental cues for floral induction in citrus. In the present study, the expression of flowering-related genes during the annual cycle of flowering and inductive low-temperature treatment in Satsuma mandarin (Citrus unshiu Marc.) trees is investigated. Simultaneously, floral induction, which occurs before the period of morphological flower development, was estimated as the number of flowers after the forcing of sprouting by defoliation at 25 pC. The expression of citrus FLOWERING LOCUS T homologues, CiFT, showed a seasonal increase during the floral induction period and was also induced by an artificial low-temperature treatment (15 pC) at which floral induction occurred. By contrast, the mRNA level of CiFT did not show any distinct changes following a warm-temperature treatment (25 pC) for 2.5 months, during which time floral induction was completely suppressed. Changes in the expression of the citrus homologues of TERMINAL FLOWER 1, LEAFY, and APETALA1 did not show any correlation with floral induction in the field or under artificial low-temperature conditions. In juvenile seedlings of Satsuma mandarin, which does not flower even under inductive low-temperature conditions, the mRNA levels of CiFT were not affected by the low-temperature treatment, unlike adult tissues. These results suggest that low temperature promotes floral induction via the activation of CiFT transcription in adult Satsuma mandarin trees and that, in the juvenile plant, CiFT transcription does not respond to low temperature.
机译：在幼年期数年后，成年柑桔树显示出开花的季节性周期性。长时间暴露于低温是柑桔中花诱导的最重要的环境线索之一。在本研究中，调查了在萨摩man（Citrus unshiu Marc。）树木的开花和诱导低温处理的年周期中开花相关基因的表达。同时，将花的诱导发生在形态花的发育时期之前，估计为在25 pC下通过脱叶强迫发芽后的花的数量。在花诱导期中，柑橘花LOCUS T同源物CiFT的表达表现出季节性增加，并且也由发生花诱导的人工低温处理（15 pC）诱导。相比之下，温热处理（25 pC）2.5个月后，CiFT的mRNA水平没有显示任何明显的变化，在此期间花诱导被完全抑制。 TERMINAL FLOWER 1，LEAFY和APETALA1的柑橘同源物表达的变化与田间或人工低温条件下的花诱导没有任何相关性。在萨摩普通话的幼树幼苗中，即使在诱导性低温条件下也不会开花，与成年组织不同，CiFT的mRNA水平不受低温处理的影响。这些结果表明，低温通过激活成年萨摩柑桔树中的CiFT转录来促进花诱导，并且在幼株中，CiFT转录不响应低温。

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