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首页> 美国卫生研究院文献>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：果糖但不是糖基半乳糖苷棉子糖和低聚糖是 多年生黑麦草受干旱胁迫的影响

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The aim of this study was to evaluate the putative role of the sucrosyl-galactosides, loliose [α-d-Gal (1,3) α-d-Glc (1,2) β-d-Fru] and raffinose [α-d-Gal (1,6) α-d-Glc (1,2) β-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 (Suc) 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, Suc 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推定的糖基半乳糖苷，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）α-d-Glc（1,2）β-d-Fru]，对多年生黑麦草具有抗旱性，并将其与果聚糖进行比较。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（Suc）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。这个增加 主要是由于长链果聚糖的积累（ 聚合> 8）并且没有伴随Suc增加。 有趣的是， 干旱胁迫的根。果糖和蔗糖半乳糖苷的推定作用 讨论有关获得耐压性。

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