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Effects of sowing dates on leaf hormone and bud differentiation of early-maturing rapeseed
KANG Yang-ge, ZHANG Li-yan, ZHANG Chun-lei*, DAI Lu-lu, YUAN Jin-zhan, LI Ming, MA Li
CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2015, Vol. 37 ›› Issue (3) : 291.
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PDF(1797 KB)
Effects of sowing dates on leaf hormone and bud differentiation of early-maturing rapeseed
To early-maturing and high yield-and-efficiency cultivation on rapeseed production, 3 varieties (early-maturing variety 1358, mid-maturing cv Zhongshuang 11 and late-maturing cv Zheshuang 8) under 3 different sowing dates (Sep 15, Sept 30 and Oct 15) were designed to study the flower bud differentiation and its relationship with endogenous hormones. Results showed that with the 3 sowing dates, flower bud differentiation of 1358 was earlier than that of mid- and late-maturing cultivars. The differentiation duration was much shorter than htat of the other two. Flower bud differentiation of 1358 was prolonged with fewer flowers by delayed sowing. Initiation of floral primordium differentiation and budding was greatly influenced by sowing dates. During late seedling stage, leaves gibberellin (GA3) and zeatin riboside (ZR) levels of 1358 were significantly higher than those of the other two, and abscisic acid (ABA) and indoly lacetic acid (IAA) levels were lower. Under late sowing, GA3 and ZR levels decreased, ABA and IAA levels increased. Under 3 sowing dates, GA3 level of 1358 reached the peak during middle flower bud differentiation period, and ZR level reached the peak during early and late flower bud differentiation periods. ABA and IAA levels were low during early flower bud differentiation but reached the peak during late flower bud differentiation. During the whole late seedling stage, GA3 level was very high which sowed in mid and late September. Ratios of GA3/ABA and ZR/IAA were higher than that of the other 2 cultivars under 3 sowing dates, but IAA/ABA were lower. In summary, late sowing on Oct 15 was appropriate for the early-maturing rapeseed to flowering at moderate time and for a high yield. Leave hormones and their ratios at late seedling stage were key factors in regulating flower bud differentiation
Early-maturing rapeseed / Sowing date / Flower bud differentiation / Endogenous hormone {{custom_keyword}} /
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