The anatomical structure responses in alfalfa to salinity-alkalinity stress of NaHCO3

doi:10.11686/cyxb20140515

Abstract

Abstract:

Seedlings of alfalfa were treated with NaHCO₃ solution at three different concentrations levels (0, 100 and 150 mmol/L) and anatomical structure characteristics of three organs (roots, stems and leaflets) were observed using paraffin section techniques and photomicrograpy. There was an obvious difference in the vascular system of alfalfa at different NaHCO₃ levels. Vascular tissue throughout the roots, stems and leaflets was reduced compared to controls, conductive capability of phloem and xylem was also much reduced and in particular, transportation of water and dissolved ions absorbed by roots was greatly restrained. Changes in other tissues of vegetative organs were also observed. The NaHCO₃ treatments made leaflets thin, with more influence on spongy tissue than on palisade tissues. Stem cross section became irregular in shape, epidermis cells became smaller and thinner, and cell wall cutinization appeared. Parenchyma cells of pith located in the center of stems were decreased in diameter, increased in number and the concentration of their inclusion was rasied. Saline and alkaline stress of NaHCO₃ promoted growth of roots, root diameter of treated plants was significantly greaterthan controls, and the diameter of xylem vessels became smaller but number of xylem vessels was increased.

CLC Number:

S816

TIAN Chen-xia,ZHANG Yong-mei,WANG Kai,ZHANG Wan. The anatomical structure responses in alfalfa to salinity-alkalinity stress of NaHCO₃[J]. Acta Prataculturae Sinica, 2014, 23(5): 133-142.

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The anatomical structure responses in alfalfa to salinity-alkalinity stress of NaHCO₃

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