COMPARATIVE SENSITIVITY OF PRIOR LISBON LEMON AND VALENCIA ORANGE TREES TO FOLIAR SODIUM AND CHLORIDE CONCENTRATIONS
COMPARATIVE SENSITIVITY OF PRIOR LISBON LEMON AND VALENCIA ORANGE TREES TO FOLIAR SODIUM AND CHLORIDE CONCENTRATIONS
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DOI：
10.1111/j.1365-3040.1989.tb02126.x
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发表时间：
1989-07-01
影响因子：
7.3
通讯作者：
ASPINALL, D
中科院分区：
文献类型：
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作者：
LLOYD, J;KRIEDEMANN, PE;ASPINALL, D
柑桔砧木对钠离子和氯离子的排斥能力不同，柑桔接穗品种的叶片对NaCl盐渍化的敏感性也不同。在两种常见的接穗中，“里斯本”柠檬似乎更敏感，而“瓦伦西亚”橙子对叶盐不太敏感。为了解释这种差异，“瓦伦西亚”橙（Citrus sinensis [L.]）奥斯贝克)和“前里斯本”柠檬（柑橘柠檬）。L)发热管。(6)在砧木上出芽，已知其排斥钠离子的能力不同，即强排斥三叶草(Poncirus Trifoliata [L。] Raf.)，而较弱的排斥物Troyer citrange （C. sinensis .times）。p . trifoliata);两种砧木对氯离子的排他性都不强。发芽树的光合光子密度为450 .亩。用含有0或50 mol m-3 Nacl的营养液浇灌。在盐渍化开始后58 d内测量生长和光合反应；研究了盐度对叶片气体交换的影响与同期叶片水分状况、相容溶质以及叶片钠离子和氯离子含量的变化有关。一旦根区盐渍化开始影响叶片溶质（第30天以后），柠檬的叶片氯化物增加幅度大于橙。虽然砧木差异对两个接穗的氯离子进入没有影响，但三叶草比特罗耶柑橘更大程度地排除了两个接穗的钠离子。柠檬根区盐渍化对接穗叶片二氧化碳吸收的减少比橘子早，且程度更大。此外，两根砧木接穗间叶片组织溶质对CO2同化的影响比较表明，柠檬对钠离子和氯离子的响应强于橙。氯离子更快地进入柠檬叶片被认为是导致接穗之间表现出这种对比的关键因素。尽管接穗对盐渍化的光合反应的对比与氯离子进入柠檬比进入橙叶更快相匹配，但“优先里斯本”柠檬对盐渍化的更强烈的光合反应并不仅仅是由于氯离子浓度更高（细胞汁液基础）。不同的物种之间的亚细胞区隔氯离子在盐水条件下被调用。
While citrus rootstocks differ in cpacity for sodium and chloride ion exclusion, citrus scion species also vary in foliar sensitivity to NaCl salinisation. Of two common scions, ''Lisbon'' lemon appears more sensitive, whereas ''Valencia'' orange is less sensitive to leaf salt. In an attempt to explain this difference, ''Valencia'' orange (Citrus sinensis [L.] Osbeck) and ''Prior Lisbon'' lemon (Citrus limon [.L] Burm. F.) were budded to rootstocks known to differ in their ability to exclude sodium ions viz. the strong excluder Trifoliata (Poncirus trifoliata [L.] Raf.), and the weaker excluder Troyer citrange (C. sinensis .times. P. trifoliata); neither rootstock shows strong exclusion of chloride ions. Budded trees were held under a photosynthetic photon flux density of 450 .mu.mol m-2s-1 and watered with nutrient solution containing either 0 or 50 mol m-3 Nacl. Growth and photosynthetic responses were measured over 58 d followign onset of salinization; salinity effects on leaf gas exchange were studied in relation to changes in leaf water status, compatible solutes and foliar content of sodium and chloride ions, over that same period. Once root-zone salinization began to influence leaf solutes (day 30 onwards), lemon showed a steeper increase in leaf chloride than occurred for orange. Although rootstock differences were without effect on this ingress of chloride ions for either scion, sodium ions were excluded from both scions to a larger extent by Trifoliata than by Troyer citrange. Carbon dioxide assimilation of scion foliage was reduced earlier and to a much larger extent by root-zone salinization in lemon than in orange. Furthermore, comparisons of CO2 assimilation in relation to leaf tissue solutes between scions (on either rootstock) showed stronger responses for both sodium and chloride ions in lemon than in orange. Faster ingress of chloride into lemon leaves was identified as the crucial factor which predisposed towards expression of that contrast between scions. Although contrasts between scions in photosynthetic respnses to salinization matched a faster ingress of chloride inot lemon than into orange leaves, the sharper photosynthetic response of ''Prior Lisbon'' lemon to salinity was not solely attributable to higher concentrations of chloride ions (cell sap basis). A difference between species in subcellular compartmentation of the chloride ion under saline conditions was invoked.