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首页> 外文期刊>Plant physiology >Fructans, but not the sucrosyl-galactosides, raffinose and loliose, are affected by drought stress in perennial ryegrass
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Fructans, but not the sucrosyl-galactosides, raffinose and loliose, are affected by drought stress in perennial ryegrass

机译：在多年生黑麦草中，果聚糖不受干旱胁迫的影响，而蔗糖基半乳糖苷，棉子糖和低聚果糖则受干旱胁迫的影响

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The aim of this study was to evaluate the putative role of the sucrosyl-galactosides, loliose [alpha-D-Gal (1,3) alpha-D-Glc (1,2) beta-D-Fru] and raffinose [alpha-D-Gal (1,6) alpha-D-Glc (1 2) beta-D-Fru], in drought tolerance of perennial ryegrass and to compare it with that of fructans. To that end, the loliose biosynthetic pathway was first established and shown to operate by a UDP-Gal: sucrose (Sue) 3-galactosyltransferase, tentatively termed loliose synthase. Drought stress increased neither the concentrations of loliose and raffinose nor the activities of loliose synthase and raffinose synthase (EC 2.4.1.82). Moreover the concentrations of the raffinose precursors, myoinositol and galactinol, as well as the gene expressions of myoinositol 1-phosphate synthase (EC 5.5.1. 4) and galactinol synthase (EC 2.4.1.123) were either decreased or unaffected by drought stress. Taken together, these data are not in favor of an obvious role of sucrosyl-galactosides in drought tolerance of perennial ryegrass at the vegetative stage. By contrast, drought stress caused fructans, to accumulate in leaf tissues, mainly in leaf sheaths and elongating leaf bases. This increase was mainly due to the accumulation of long-chain fructans (degree of polymerization > 8) and was not accompanied by a Suc increase. Interestingly, Sue but not fructan concentrations greatly increased in drought-stressed roots. Putative roles of fructans and sucrosyl-galactosides are discussed in relation to the acquisition of stress tolerance.
机译：这项研究的目的是评估蔗糖基半乳糖苷，低聚糖[α-D-Gal（1,3）α-D-Glc（1,2）β-D-Fru]和棉子糖[α- D-Gal（1,6）alpha-D-Glc（1 2）beta-D-Fru]，常年黑麦草的耐旱性并与果聚糖进行比较。为此，首先建立了蔗糖生物合成途径，并证明其通过UDP-Gal：蔗糖（Sue）3-半乳糖基转移酶起作用，该酶暂定称为蔗糖合酶。干旱胁迫既不增加低聚果糖和棉子糖合酶的浓度，也不增加低聚果糖合酶和棉子糖合酶的活性（EC 2.4.1.82）。此外，棉子糖前体，肌醇和半乳糖醇的浓度以及肌醇1-磷酸合酶（EC 5.5.1。4）和半乳糖醇合酶（EC 2.4.1.123）的基因表达降低或不受干旱胁迫的影响。综上所述，这些数据不利于蔗糖基半乳糖苷在营养期对多年生黑麦草的耐旱性具有明显作用。相反，干旱胁迫导致果聚糖积累在叶组织中，主要在叶鞘和伸长的叶基中。这种增加主要是由于长链果聚糖的积累（聚合度> 8），而不伴随Suc的增加。有趣的是，在干旱胁迫的根中，Sue而不是果聚糖的浓度大大增加。讨论了果聚糖和蔗糖基-半乳糖苷的推定作用与耐压力的获得有关。

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