Bud dormancy in Japanese pear

作者：Y. Takemura, F. Tamura · 发表于：Advances in Horticultural Science · 年份：2013 · DOI：10.36253/ahsc-18448 · 被引用次数：1

In this paper, after reviewed recent advances in research of endodormancy, research on Japanese pear were reported. In the case of Japanese pear, endodormancy was induced by low temperature of 5oC, without effect of day length. Chilling requirement (CR) of Japanese pear for completion of leaf bud endodormancy shows wide range from below 800 to 1800 chilling units (CU). We investigated the budbreak percent in Taiwanese pear Yokoyama, in Japanese pear strain TH3 and their F1 for 3 years. The percentage of budbreak in TH3 was lower than Yokoyama on any observational days and it gradually increased from early December to early January. The percentage of budbreak in F1 plants was widely distributed between that of Yokoyama and TH3 on all observational days. From results of chi-square test, it was suggested that pear plant had quantitative trait loci (QTL) as genetic factor to decide chilling requirement (CR) for breaking endodormancy. Expression levels of gene encoding GAST-like gibberellin (GA) regulated protein increased with development of endodormancy in Japanese pear cultivars. ABA concentrations in bud of Japanese pear in open-field were increased with the induction of endodormancy by chilling. However, the ABA concentrations in un-chilled plants were lower.