Responses to flooding and drought stress by two citrus rootstock seedlings with different water-use efficiency
Responses to flooding and drought stress by two citrus rootstock seedlings with different water-use efficiency
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DOI：
10.1111/j.1399-3054.2007.00925.x
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发表时间：
2007-08-01
影响因子：
6.4
通讯作者：
Perez-Perez, Juan G.
中科院分区：
文献类型：
--
作者：
Garcia-Sanchez, Francisco;Syvertsen, James. P.;Perez-Perez, Juan G.
以柑桔（Citrus sinensis (L.)） 6月龄幼苗为研究对象，研究了叶片水分关系、净气体交换以及叶片和根系成分对9 d干旱胁迫或土壤淹水的响应。的Osb。x三叶藤；和克娄巴特拉柑桔（柑桔）。田中交货;在温室的原生砂容器中生长。在干旱期结束时，两种植物的最小茎水势相似，但Cleo的叶片相对含水量（RWC）和叶片全膨润渗透势(Psi（100)(pi)）高于Carr。淹水对RWC没有影响，但渗透调节（OA）和Psi(100)（pi）在Cleo地区高于Carr地区。干旱对叶片净CO2同化率（A(CO2)）的影响大于洪涝对叶片净CO2同化率（A(CO2)）的影响。Carr的叶片水分利用效率（A(CO2)/蒸腾）较低，受DS和洪水胁迫的降低幅度大于Cleo。胁迫植物的细胞间CO2浓度（C-i）高于对照植物，表明叶绿素降解和叶绿素荧光[PSII的最大量子效率（Fv/Fm，其中Fm为最大荧光，F-0为暗适应叶片的最小荧光）]等非气孔因素对A（CO2）的限制比气孔导度更重要。在这两个基因型中，干旱增加了叶片脯氨酸，而洪水没有增加，而两种胁迫都增加了根中的脯氨酸。DS提高了叶片可溶性糖含量，淹水降低了Cleo叶片可溶性糖含量。总体而言，除叶片Ca在Cleo中呈下降趋势外，DS有增加叶片和根系Ca、K、Mg、Na和Cl浓度的趋势，而淹水有降低这些离子浓度的趋势。基于水关系和净气体交换，Cleo比Carr更能耐受短期DS和水淹应力。
Leaf water relations, net gas exchange and leaf and root constituent responses to 9 days of drought stress (DS) or soil flooding were studied in 6-month-old seedlings of Carrizo citrange [Citrus sinensis (L.) Osb. x Poncirus trifoliata L.; Carr] and Cleopatra mandarin (Citrus resnhi Hort. ex Tanaka; Cleo) growing in containers of native sand in the greenhouse. At the end of the drought period, both species had similar minimum stem water potentials but Cleo had higher leaf relative water content (RWC) and higher leaf osmotic potential at full turgor (Psi(100)(pi)) than Carr. Flooding had no effect on RWC but osmotic adjustment (OA) and Psi(100)(pi) were higher in Cleo than in Carr. Net CO2 assimilation rate (A(CO2)) in leaves was decreased more by drought than by flooding in both species but especially in Carr. Leaf water-use efficiency (A(CO2)/transpiration) was lower in Carr and was decreased more by DS and flooding stress than in Cleo. Higher values of intercellular CO2 concentration (C-i) in stressed plants than in control plants indicated that non-stomatal factors including chlorophyll degradation and chlorophyll fluorescence [maximum quantum efficiency of PSII (Fv/Fm, where Fm is the maximum fluorescence and F-0, minimum fluorescence in dark-adapted leaves)] were more important limitations on A(CO2) than stomatal conductance. In both genotypes, leaf proline was increased by drought but not by flooding, whereas both stresses increased proline in roots. Soluble sugars in leaves were increased by DS, and flooding decreased leaf sugars in Cleo. In general, DS tended to increase the concentrations of Ca, K, Mg, Na and Cl in both leaves and roots, whereas flooding tended to decrease these ions with the exception of leaf Ca in Cleo. Based on water relations and net gas exchange, Cleo was more tolerant to short-term DS and flooding stress than Carr.