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首页> 外文期刊>Journal of the American Society for Horticultural Science >Water Relations and Abscisic Acid in Pot-grown Strawberry Plants under Limited Irrigation.
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Water Relations and Abscisic Acid in Pot-grown Strawberry Plants under Limited Irrigation.

机译：限量灌溉条件下盆栽草莓植株的水分关系和脱落酸。

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摘要

We investigated the effect of full irrigation (FI), deficit irrigation (DI), partial root zone drying (PRD), and nonirrigation (NI) on soil and plantwater relations, leaf stomatal conductance (g(s)), and abscisic acid (ABA) concentration in the xylem sap ([ABA](xylem)) of pot-grown strawberry plants (Fragaria xananassa cv. Honeoye) in a greenhouse experiment. The DI and PRD treatments, irrigated with 70% of the volume of FI, reduced soil water content (theta), whereas crown water potential (psi(crown)), leaf water potential (psi(leaf)), and g(s) were only significantly reduced from 11 to 15 days after initiation of irrigation treatments. Although [ABA](xylem) was not significantly affected by the DI and PRD treatments, the NI plants increased [ABA](xylem), which coincided with decreased psi(crown), psi(leaf), and g(s) 3 to 4 days after withholding irrigation. When psi(crown) dropped below a critical value of 0.4 MPa, [ABA](xylem) was linearly correlated with psi(crown). The g(s) tended to decrease as a function of [ABA](xylem), but g(s) was also affected by the water vapor pressure deficit (VPD) of the air. It is concluded that we did not observe a significant difference between strawberry plants grown in PRD and DI because psi(crown) had to be below 0.4 MPa and soil water potential (psi(soil)) had to be below 0.25 MPa before [ABA](xylem) increased, these values were only reached toward the end of the experimental period (1115 days after initiation of irrigation treatments).
机译：我们研究了完全灌溉（FI），亏缺灌溉（DI），部分根区干燥（PRD）和非灌溉（NI）对土壤和植物水分关系，叶片气孔导度（g（s））和脱落酸（在温室试验中，盆栽草莓植物（Fragaria xananassa cv。Honeoye）木质部汁液（[ABA]（木质部））中的ABA）浓度较高。 DI和PRD处理采用FI量的70％灌溉，减少了土壤水分（theta），而冠层水势（psi（冠）），叶水势（psi（叶））和g（s）在开始灌溉处理后的11到15天中，这些元素仅显着减少。尽管[ABA]（木质部）不受DI和PRD处理的影响，但NI植物增加了[ABA]（木质部），与psi（冠），psi（叶）和g（s）3降低有关。停药后4天。当psi（皇冠）降至0.4 MPa的临界值以下时，[ABA]（木质部）与psi（皇冠）线性相关。 g（s）倾向于根据[ABA]（木质部）降低，但是g（s）还受到空气中水蒸气压亏缺（VPD）的影响。结论是，在[ABA]之前，psi（冠）必须低于0.4 MPa，土壤水势（psi（土壤））必须低于0.25 MPa，因此在PRD和DI中生长的草莓植株之间没有观察到显着差异。 （木质部）增加，这些值仅在实验期末（开始灌溉处理后1115天）达到。

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