Effect of foliar application of antitranspirant on photosynthesis and water relations of pepper plants under different levels of CO2 and water stress
Effect of foliar application of antitranspirant on photosynthesis and water relations of pepper plants under different levels of CO2 and water stress
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DOI：
10.1016/j.jplph.2010.04.010
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发表时间：
2010-01-01
影响因子：
4.3
通讯作者：
Madrid, Ramon
中科院分区：
文献类型：
--
作者：
del Amor, Francisco M.;Cuadra-Crespo, Paula;Madrid, Ramon
诸如叶面施用抗蒸腾剂等策略具有调节蒸腾的潜力，但通常，由于气孔导度降低而导致的CO2交换的限制会损害这种有益效果。大气[CO2]浓度升高可显著促进CO2扩散，同时有效降低蒸腾作用。在本试验中，我们研究了甜椒（Capsicum annuum L）在两种[CO2]（380和2000 μ mol mol（-1））和两种干旱强度（不灌溉4或8 d）下对叶面喷施抗蒸腾剂（AT）的反应。结果表明，气孔导度和蒸腾量降低，而AT损害光合作用在标准，但不完全灌溉植物在[CO2]升高。干旱4d后，这种效应已经明显。干旱对叶绿素荧光（F-v/F-m）的影响较小。此外，根呼吸增加，在升高[CO2]，但8天的干旱后，它是较高的AT处理的植物比非喷洒植物。叶水势受干旱的影响更高的[CO2]相比，在环境中，特别是在8天的干旱，AT最大限度地减少叶水势。叶片脯氨酸和淀粉含量受CO2浓度和AT浓度的共同影响，尤其是干旱8d后。此外，增加[CO2]促进淀粉的积累，但导致可溶性有机渗透压物质的组织浓度降低，因此减少了8 d的水扣留后的渗透调节，相对于环境[CO2]。这项研究表明，除了报道的[CO2]升高对干旱胁迫的有益作用外，AT还可以显着提高甜椒植物的耐旱性。(C)2010年Elsevier GmbH。All rights reserved.
Strategies such as foliar application of antitranspirants have the potential to regulate transpiration, but often, the limitation of CO2 exchange as a result of reduced stomatal conductance can impair this beneficial effect. Elevated ambient [CO2] could significantly improve CO2 diffusion while effectively reducing transpiration. In this experiment, we examined the response of sweet pepper (Capsicum annuum L) to the foliar application of antitranspirant (AT) under two [CO2] (380 and 2000 mu mol mol(-1)) and two drought intensities (4 or 8 d without irrigation). The results showed that stomatal conductance and transpiration were reduced, while AT impaired photosynthesis at standard, but not at elevated [CO2] of fully irrigated plants. This effect was already apparent after 4d of drought. Drought had a minor impact on chlorophyll fluorescence (F-v/F-m). Additionally, root respiration was increased at elevated [CO2] but, after 8 d of drought, it was higher for plants treated with AT than for non-sprayed plants. Leaf water potential was affected more by drought at ambient compared to elevated [CO2], and, especially after 8 d of drought, AT minimized the reductions in leaf water potential. Leaf concentrations of proline and starch were affected by both [CO2] and AT, especially after 8d of drought. Moreover, increasing [CO2] promoted the accumulation of starch, but led to decreases in the tissue concentrations of the soluble organic osmolytes, and hence diminished osmotic adjustment after 8 d of water withholding, relative to ambient [CO2]. This study indicates that, in addition to the reported beneficial effect of elevated [CO2] on drought stress, AT could significantly improve drought tolerance in sweet pepper plants. (C) 2010 Elsevier GmbH. All rights reserved.