干旱胁迫下毛毛Erythrina velutina幼苗生长评价及水分关系

Elizamar Ciríaco da Silva, Marcos Fellipe da Silva, Rejane M. Nogueira, M. B. Albuquerque
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引用次数: 45

摘要

野赤藓。(俗称:mulungu)是巴西东北部半干旱地区发现的一种落叶,向日葵。为了评价木龙姑幼苗在不同含水量土壤中的生长和水分关系,在温室条件下,采用100%、75%、50%和25%田间水分处理(FC)进行了试验。测定了黎明前(Ψpdw)和正午叶片水势(Ψmdw)、相对含水量(RWC)、株高、叶数、茎粗、叶面积(LA)、比叶面积(SLA)、叶面积比(LAR)、各器官干物质、生物量分配和根冠比。30天后Ψpdw治疗组间无差异;然而,在中午,对照植株和低于75% FC的植株比含有50%和25% FC的植株的Ψmdw减少幅度更大。90天后,只有低于50% FC的植物表现出Ψmdw的减少。RWC在中午减少,但处理之间没有差异。叶片数、茎粗、株高、各器官的LA、SLA和干质量等指标表明,水分亏缺导致植株几乎所有生长参数均降低,尤其是含25% FC的植株。LAR和根冠比不受影响。木龙古幼苗似乎在干物质分布模式没有变化的情况下,已经发展出了克服间歇性干旱的乡村性。膨胀压力的维持似乎更多地与生长比的降低有关,而不是与叶片水势的降低有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Growth evaluation and water relations of Erythrina velutina seedlings in response to drought stress
Erythrina velutina Willd. (common name: mulungu) is a deciduous, heliophyte found in the semi-arid region of northeastern Brazil. To evaluate the growth and water relations of mulungu seedlings in soils with different degrees of moisture content, an experiment was carried out under greenhouse conditions using four water treatments (100%, 75%, 50% and 25% of the field capacity- FC). Predawn (Ψpdw) and midday leaf water potential (Ψmdw), relative water content (RWC), plant height, number of leaves, stem diameter, leaf area (LA), specific leaf area (SLA), leaf area ratio (LAR), dry matter in different organs, biomass partitioning and root:shoot ratio were evaluated. No differences were detected between treatments for Ψpdw after 30 days; however, at midday, control plants and those under 75% FC underwent a greater reduction in Ψmdw than plants cultivated with 50% and 25% FC. After 90 days, only the plants under 50% FC exhibited a reduction in Ψmdw. RWC was reduced at midday, but there were no differences between treatments. Nearly all growth parameters were reduced due to water deficit, especially in the plants with 25% FC, as determined by the number of leaves, stem diameter, plant height, LA, SLA and dry mass in several organs. LAR and root:shoot ratio were not affected. Mulungu seedlings seem to have developed rusticity to overcome intermittent droughts with no change in the pattern of dry matter distribution. The maintenance of turgor pressure seems to be more associated to a reduction in the growth ratio than a reduction in leaf water potential.
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