激素和碳水化合物都参与了繁殖对芒果树营养芽生长的负面影响：不规则生育的后果,Tree Physiology

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激素和碳水化合物都参与了繁殖对芒果树营养芽生长的负面影响：不规则生育的后果
Tree Physiology ( IF 3.5 ) Pub Date : 2021-06-04 , DOI: 10.1093/treephys/tpab079
Mathilde Capelli _{1,

2} , Pierre-Éric Lauri _{2,

3} , Mathieu Léchaudel _{2,

4} , Frédéric Normand _{1,

2}

Affiliation

一个周期中果实生产对下一周期繁殖的负面影响通常可以通过两个互补的过程来解释：激素合成和碳水化合物动员。我们的研究集中在芒果（Mangifera indicaL.) 已表明繁殖减少并延迟了营养芽的生长。这反过来又会影响下一个周期的开花和结果。因此，营养生长在连续几年的不规则水果生产模式中起着关键作用。我们的目标是破译激素和碳水化合物对繁殖对营养生长的负面影响的各自作用。我们分析了两种芒果品种 Cogshall 和 José 在终轴中各种激素（生长素、细胞分裂素、脱落酸）和碳水化合物（葡萄糖、蔗糖、淀粉）浓度的变化以及营养和繁殖命运，其特征在于连续物候的不同轴承模式生长周期中的时期。花序中的生长素浓度很高，带有花序或果实的果梗和轴，表明生长素诱导抑制开花和结果轴中的营养芽生长。此外，生长的水果是强大的水槽器官，会耗尽非结果轴上的碳水化合物。在营养生长期间，这种淀粉消耗可能导致 Cogshall 的生殖轴和 José 的生殖轴和非生殖轴的营养芽生长的可能性降低和延迟。两个品种在早期果实生长期间静止和开花 GU 中的淀粉动态及其果实成熟时的淀粉浓度存在差异，这可能与观察到的对比作物负荷和/或光合能力或碳水化合物分配的差异有关。

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Hormones and carbohydrates are both involved in the negative effects of reproduction on vegetative bud outgrowth in the mango tree: Consequences for irregular bearing

The negative effects of fruit production during one cycle on reproduction during the following cycle are generally explained by two complementary processes: hormone synthesis and carbohydrate mobilization. Our study focused on mango (Mangifera indica L.) for which it has been shown that reproduction decreases and delays vegetative bud outgrowth. This, in turn, affects flowering and fruiting in the following cycle. Vegetative growth therefore plays a pivotal role in irregular fruit production patterns across consecutive years. Our aim was to decipher the respective roles of hormones and carbohydrates on the negative effects of reproduction on vegetative growth. We analyzed the changes in various hormone (auxin, cytokinin, abscisic acid) and carbohydrate (glucose, sucrose, starch) concentrations in terminal axes with vegetative and reproductive fates of two mango cultivars, Cogshall and José, characterized by different bearing patterns across consecutive phenological periods during a growing cycle. Auxin concentrations were high in inflorescences, fruit peduncles and axes bearing inflorescences or fruit, suggesting auxin-induced inhibition of vegetative bud outgrowth in the flowering and fruiting axes. Moreover, growing fruits, which are strong sink organs, depleted carbohydrates from non-fruiting axes. During vegetative growth, this starch depletion probably contributed to decreasing the probability of and to delaying vegetative bud outgrowth of reproductive axes for Cogshall, and of reproductive and non-reproductive axes for José. Starch dynamics in quiescent and flowering GUs during early fruit growth and their starch concentrations at fruit maturity differed between the two cultivars, presumably in relation to the observed contrasted crop loads and/or to differences in photosynthetic capacity or carbohydrate allocation. These differences between the two cultivars in terms of starch concentration in terminal axes during vegetative growth could partly explain their different bearing patterns.

更新日期：2021-06-07

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