干旱胁迫对宁夏枸杞生长及果实糖分积累的影响

In? uence of Drought Stress on Plant Growth and Sugar Accumulation in Fruit of Lycium barbarum L

文章研究不同干旱胁迫下宁夏枸杞生长及果实糖分积累的变化规律,为宁夏枸杞在干旱地区高产栽培提供参考依据。采用盆栽控水试验,设置正常灌水、轻度干旱、中度干旱和重度干旱处理,研究了干旱胁迫对宁夏枸杞植株生长、生物量分配以及果实糖分积累的影响。结果表明:干旱抑制宁夏枸杞新稍、果实、株高和地径的生长;随着干旱程度加剧,根和茎中干物质分配率逐渐升高,而枝条、叶和果实中干物质分配率大幅降低;轻度干旱有利于果实发育过程中果糖的积累,中度和重度干旱胁迫则不利于成熟期果糖和蔗糖积累;干旱胁迫明显降低成熟期转化酶、蔗糖磷酸合成酶(SPS)和蔗糖合成酶(SS)的活性;果实发育过程中果糖的含量与SPS和转化酶活性存在极显著相关。可见,在果实发育期,土壤含水量为田间持水量55%以上,能促进宁夏枸杞果实中糖分积累,有效提高果实品质。

A study of the effect of different water stress on plant growth and sugar accumulation in fruit of Lycium barbarum aimed at providing theoretical basis for high-yield cultivating of this plant for the arid regions. The responses of plant growth, biomass allocation and sugar accumulation were studied in L. barbarum under normal irrigation, light drought, moderate drought and severe drought in a pot experiment. The results showed that the growth of new shoots, fruit, height and stem diameter was inhibited under drought stress. With the increasing of drought stress, the dry matter distribution in root and stem gradually increased, while that in branch, leaf and fruit considerably decreased. The fructose cumulant increased during fruit development under light drought, but the fructose and sucrose contents were reduced under moderate drought and severe drought at the maturity stage. The activities of invertase, sucrose phosphate synthase （SPS） and sucrose synthase （SS） were significantly reduced under drought at the maturity stage. The fructose content has significant correlations with the activities of SPS and invertase during fruit development. It is therefore suggested the soil moisture content more than 55% of field water capacity can promote the accumulation of sugar and improve the quality of fruit during the fruit development.