Heat tolerance plays an important role in regulating remontant flowering in an F1 population of octoploid strawberry (Fragaria×ananassa)
Heat tolerance plays an important role in regulating remontant flowering in an F1 population of octoploid strawberry (Fragaria×ananassa)
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耐热性在八倍体草莓（Fragaria×ananassa）F1群体的复花调控中发挥着重要作用
DOI：
10.3233/jbr-130056
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发表时间：
2013
影响因子：
1.7
通讯作者：
J. Hancock
中科院分区：
文献类型：
--
作者：
Sonali Mookerjee;Megan M. Mathey;C. Finn;Zhongna Zhang;J. Hancock
背景技术背景：草莓花的发生通常根据光周期敏感性来分类，然而，温度在决定花的发生中也起着重要作用。目的：我们的目标是确定耐热性在调节草莓（Fragaria×ananassa）分离群体中的诱导开花中所起的作用。方法：将非remontant（短日照）品种‘Honeoye’和remontant品种‘Tribute’杂交，在温室中长光周期下，在三种温度条件（17 ℃、20 ℃和23 ℃）下培养54个后代，并比较后代之间花和匍匐茎形成的差异。此外，同一家族的克隆复制个体在密歇根州和俄勒冈州的田间生长，使得在温室研究中观察到的每种基因型的耐热性程度可以与它们在田间的表型（remontant与non-remontant）进行比较。研究结果：在温室研究中观察到一个显着的基因型x环境的相互作用，表明有一个强大的遗传成分调节的个人对温度升高的反应。耐热性的水平，定义为在23 ℃与17 ℃的花数的差异，在后代中显示出连续的分布，表明多基因控制。在温室试验中，大多数在田间表现优异的基因型在23 ℃下比在17 ℃下产生更多的花。在23 ℃时，两个亲本的花起始都减少了，但在23 ℃时，“贡品”比“蜂蜜”产生了更多的花（48.0比11.3）。大多数谏官的后代很少有跑步者，尽管也有一些明显的例外。结论：温度耐受性在劝诫基因型的花和侧枝发生中起重要作用。可以选择耐热性高的基因型，这些基因型在夏季热量水平高度可变的环境中更依赖开花。
BACKGROUND: Flower initiation in strawberry is often classified by photoperiod sensitivity; however, temperature also plays a major role in determining flower initiation. OBJECTIVE: Our goal was to determine the role heat tolerance plays in regulating remontant flowering in a segregating population of strawberry, Fragaria×ananassa. METHODS: Non-remontant (short day)‘Honeoye’ and remontant ‘Tribute’ were crossed and 54 progeny were grown in three temperature regimes (17, 20, and 23 ◦ C) under a long photoperiod in the greenhouse and differences in flower and runner formation among the progeny were compared. In addition, clonally replicated individuals of the same family were grown in the field in Michigan and Oregon, so that the extent of heat tolerance observed for each genotype in the greenhouse studies could be compared to their phenotype in the field (remontant vs. non-remontant). RESULTS: A significant Genotype x Environment interaction was observed in the greenhouse studies, indicating that there was a strong genetic component regulating the response of the individuals to increasing temperature. The level of heat tolerance, as defined as the difference in flower numbers at 23 ◦ C vs. 17 ◦ C,showed a continuous distribution among the progeny, indicating polygenic control. The majority of the genotypes that were remontant in the field produced more flowers at 23 ◦ C than at 17 ◦ Ci n the greenhouse trials. Flower initiation in both the parents was reduced at 23 ◦ C, but ‘Tribute’ produced significantly more flowers than ‘Honeoye’ at 23 ◦ C (48.0 vs. 11.3). Most remontant progeny had few runners, although there were some notable exceptions. CONCLUSIONS: Temperature tolerance plays an important role in the flower and runner initiation of remontant genotypes. Genotypes with high heat tolerance can be selected that will more dependably flower in environments with highly variable levels of summer heat.