Calcium partitioning and allocation and blossom-end rot development in tomato plants in response to whole-plant and fruit-specific abscisic acid treatments
Calcium partitioning and allocation and blossom-end rot development in tomato plants in response to whole-plant and fruit-specific abscisic acid treatments
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DOI：
10.1093/jxb/ert364
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发表时间：
2014-01-01
影响因子：
6.9
通讯作者：
Mitcham, Elizabeth J.
中科院分区：
文献类型：
--
作者：
de Freitas, Sergio Tonetto;McElrone, Andrew J.;Mitcham, Elizabeth J.
调节植物和果实中Ca-2分配和分配的机制仍然知之甚少。本研究的目的是确定Ca-2分配和分配在番茄植株和果实响应全株和果实特异性脱落酸（阿坝）处理，以及分析Ca-2分配和分配的变化对果实的敏感性的影响，钙缺乏症花底腐病（BER）在水分胁迫条件下。栽培品种Ace 55（Vf）的番茄植物在温室中生长，并在果实生长和发育期间暴露于低Ca-2条件。从授粉后1天（DAP）开始，开始以下处理：（i）每周用去离子水（对照）或（ii）用500 mg/l（l）阿坝喷洒整株植物;或每周将每株植物上的果实（iii）浸入去离子水（对照）或（iv）浸入500 mg/l（l）阿坝中。在15 DAP，BER完全防止由整株或果实特定的阿坝处理，而植物或果实处理的水有1619% BER的发病率。在30 DAP，BER由整株阿坝处理防止，而阿坝浸渍的果实有16%和水处理的植物或果实有BER的发病率为36 - 40%。结果表明，喷施阿坝增加了木质部液流和Ca-2向果实中的移动，导致较高的果实组织和水溶性质外体Ca-2浓度，防止BER的发展。虽然果实特异性阿坝处理对木质部液流速率或Ca-2移动到果实中没有影响，但它增加了果实组织水溶性质外体Ca-2浓度，并在较小程度上降低了果实对BER的敏感性。
The mechanisms regulating Ca-2 partitioning and allocation in plants and fruit remain poorly understood. The objectives of this study were to determine Ca-2 partitioning and allocation in tomato plants and fruit in response to whole-plant and fruit-specific abscisic acid (ABA) treatments, as well as to analyse the effect of changes in Ca-2 partitioning and allocation on fruit susceptibility to the Ca-2 deficiency disorder blossom-end rot (BER) under water stress conditions. Tomato plants of the cultivar Ace 55 (Vf) were grown in a greenhouse and exposed to low Ca-2 conditions during fruit growth and development. Starting 1 day after pollination (DAP), the following treatments were initiated: (i) whole plants were sprayed weekly with deionized water (control) or (ii) with 500mg l(1) ABA; or fruit on each plant were dipped weekly (iii) in deionized water (control) or (iv) in 500mg l(1) ABA. At 15 DAP, BER was completely prevented by whole-plant or fruit-specific ABA treatments, whereas plants or fruit treated with water had 1619% BER incidence. At 30 DAP, BER was prevented by the whole-plant ABA treatment, whereas fruit dipped in ABA had a 16% and water-treated plants or fruit had a 3640% incidence of BER. The results showed that spraying the whole plant with ABA increases xylem sap flow and Ca-2 movement into the fruit, resulting in higher fruit tissue and water-soluble apoplastic Ca-2 concentrations that prevent BER development. Although fruit-specific ABA treatment had no effect on xylem sap flow rates or Ca-2 movement into the fruit, it increased fruit tissue water-soluble apoplastic Ca-2 concentrations and reduced fruit susceptibility to BER to a lesser extent.