盐胁迫和叶面施氮对石榴形态生理和气体交换的影响

F. Figueiredo, R. T. Fátima, J. S. Nóbrega, T. I. Silva, J. Ferreira, J. Ribeiro, M. L. S. Leal, L. A. A. Soares, T. J. Dias
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引用次数: 0

摘要

盐度是影响石榴气体交换和生长的非生物胁迫之一。在这种情况下,通过叶片施用氮肥可以尽量减少这些影响。因此,本研究的目的是评价叶片施氮对微咸水灌溉石榴幼苗的影响。采用随机分组的不完全因子设计(中心复合设计),采用5种电导率的灌溉水ECw(0.50、1.15、2.75、4.35和5.00 dS - m-1)和5种剂量的叶面氮肥FNF(0、0.33、1.15、1.97和2.30 g - L-1), 4个重复,每个试验地块2株植物。在盐水灌溉60 d后,测定植株高度、叶片数量、茎粗和气体交换(气孔导度、净光合作用、胞间CO2浓度、蒸腾速率、瞬时羧化效率、瞬时水分利用效率和内在水分利用效率)。灌溉水含盐量对石榴幼苗气体交换有不利影响。叶面施氮量为1.31 g L-1可提高盐胁迫下石榴幼苗的株高和叶数。叶面施氮量达1.59 g L-1可提高石榴幼苗的净光合作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Morphophysiology and gas exchange of pomegranate under salt stress and foliar application of nitrogen
ABSTRACT Salinity is one of the abiotic stresses that affect gas exchange and growth of pomegranate. In this context, the application of nitrogen fertilizer through the leaves can minimize these effects. Thus, the objective of present study was to evaluate the effect of foliar nitrogen fertilization on pomegranate seedlings irrigated with brackish water. The design used was randomized blocks, in an incomplete factorial scheme (Central Composite Design) with five electrical conductivities of irrigation water - ECw (0.50, 1.15, 2.75, 4.35, and 5.00 dS m-1) and five doses of foliar nitrogen fertilization - FNF (0, 0.33, 1.15, 1.97, and 2.30 g L-1), with four replicates and two plants per experimental plot. Plant height, number of leaves, stem diameter, and gas exchange (stomatal conductance, net photosynthesis, intercellular CO2 concentration, transpiration rate, instantaneous carboxylation efficiency, instantaneous water use efficiency, and intrinsic water use efficiency) were evaluated at 60 days after the beginning of irrigation with saline water. Salinity of irrigation water negatively affects the gas exchange of pomegranate seedlings. Foliar nitrogen fertilization up to 1.31 g L-1 improves plant height and number of leaves in pomegranate seedlings under salt stress. Foliar nitrogen fertilization up to 1.59 g L-1 increases the net photosynthesis of pomegranate seedlings.
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