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当菊芋(Helianthus tuberosus)长出6片叶子时进行不同日照长度处理,在不同时期观测菊芋花芽形成和开花情况。结果表明,菊芋花芽形成和开花的临界日照长度大约为13小时,短于13小时的,可以诱导形成花芽并开花,14小时以上的抑制花芽形成。在临界日照长度范围内,菊芋花芽数随日照长度延长而增加。诱导菊芋花芽形成和开花的短日照数为17天。形成的花芽和开花数随短日照天数延长而增加,相关系数分别为 r=1和 r=0.990。诱导后形成的花芽有逆转现象。在临界日照长度范围内,逆转程度与日照长度成负相关。短日照诱导后,在短于临界日长中,愈接近临界日照长度的正常花数愈多,长于临界日照长度的,正常花数没有差异。
When Helianthus tuberosus grows 6 leaves, different length of sunshine length is treated, and flower bud formation and flowering are observed at different times. The results showed that the critical sunlight of Jerusalem artichoke flower bud formation and flowering is about 13 hours, and the shortened 13 hours can induce the formation of flower buds and flowering, while the inhibition of flower bud formation over 14 hours. Within the critical sunshine length, the number of flower buds of Jerusalem artichoke increased with the length of the sunshine. The number of short days of induced flower bud formation and flowering was 17 days. The formation of flower buds and flowering numbers increased with the days of short sunshine, and the correlation coefficients were r = 1 and r = 0.990, respectively. After the formation of flower buds have reversed the phenomenon. Within the critical sunshine length, the degree of reversal is negatively correlated with the length of sunshine. After short-day induction, shorter than the critical day long, the closer the normal number of flowers to the critical sunshine duration, longer than the critical sunshine length, there is no difference between the normal number of flowers.