[Exogenous nitric oxide accelerates soluble sugar, proline and secondary metabolite synthesis in Ginkgo biloba under drought stress].

植物生理与分子生物学学报 Pub Date : 2007-12-01
Gang-Ping Hao, Xi-Hua Du, Ren-Jiu Shi
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引用次数: 0

Abstract

The effects of exogenous nitric oxide donor sodium nitroprusside (SNP) on substance metabolism of Ginkgo biloba leaves under drought stress were studied. The results showed that 250 micromol/L SNP (Fig.2) treatment under 35% relative soil water content (RSWC) stress (Fig.1) raised remarkably soluble sugar content (Fig.3), proline content (Fig.4), phenylalanine ammonia lyase (PAL) activity (Fig.5), flavonoids (Fig.6) and ginkgolides content (Fig.7) of G. biloba leaves. Hemoglobin, used as NO scavenger, counteracted the effects of SNP in raising the soluble sugar (Fig.3), proline (Fig.4), flavonoid (Fig.6), ginkgolide content (Fig.7) and PAL activities (Fig.5), which indicates that the effects of sodium nitroprusside were through the nitric oxide released from sodium nitroprusside. We propose from these results that the roles of flavonoids and ginkgolides are the same as those of soluble sugars and proline under drought stress. NO may alleviate the damage caused by drought stress through raising soluble sugar, proline, flavonoid and ginkgolide content.

[外源一氧化氮加速干旱胁迫下银杏可溶性糖、脯氨酸和次生代谢物的合成]。
研究了外源一氧化氮供体硝普钠(SNP)对干旱胁迫下银杏叶片物质代谢的影响。结果表明,在35%土壤相对含水量(RSWC)胁迫(图1)下,250微mol/L SNP处理(图2)显著提高了银杏叶可溶性糖含量(图3)、脯氨酸含量(图4)、苯丙氨酸解氨酶(PAL)活性(图5)、黄酮类化合物(图6)和银杏内酯含量(图7)。血红蛋白作为NO清除剂,抵消了SNP的作用,提高了可溶性糖(图3)、脯氨酸(图4)、类黄酮(图6)、银杏内酯含量(图7)和PAL活性(图5),说明硝普钠的作用是通过硝普钠释放的一氧化氮来实现的。这些结果表明,黄酮类化合物和银杏内酯在干旱胁迫下的作用与可溶性糖和脯氨酸相同。NO可能通过提高可溶性糖、脯氨酸、类黄酮和银杏内酯含量来缓解干旱胁迫造成的损害。
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