阿拉善荒漠优势植物可溶性糖的季节变化

Seasonal variations of soluble sugars in dominant plant species in Alxa Desert of Northwest China

研究了阿拉善荒漠天然植被区优势植物梭梭、白刺、霸王、红砂和珍珠叶片的葡萄糖、果糖、蔗糖和可溶性总糖含量在不同生长季节的变化特征。结果表明,梭梭和珍珠的可溶性总糖含量在季节变化中呈明显的"V"型特征;白刺和红砂的可溶性总糖含量在不同生长季节的变化特征为"N"型;霸王可溶性总糖含量的季节变化呈明显的"W"型。在不同的生长季节,红砂和珍珠的蔗糖/己糖比>1,并且具有相同的变化趋势。荒漠优势植物在不同生长季节积累的可溶性糖中,蔗糖所占的比例最大,其次是果糖,葡萄糖所占的比例最小。本研究有助于更好地理解荒漠植物的生理调节机制和适应方式。

This paper studied the variation characteristics of the contents of glucose, tructose, sucrose, and total soluble sugar in the leaves of dominant plant species Haloxylon ammodendron, Nitraria tangutorum, Zygophyllum xanthoxylon, Reaumuria songariea, and Salsola passerina in Alxa desert in different growth seasons. The total soluble sugar content in the desert dominant plant species exhibited different seasonal variation patterns, with a ＂V＂ curve for H. ammoden- dron and S. passerine, an ＂N＂ curve for N. tangutorum and R. songarica, and a ＂W＂ curve for Z. xanthoxylon. The ratio of sucrose to hexose in R. songarica and S. passerine leaves was grea ter than 1, and had similar seasonal variation pattern. Sucrose occupied the largest proportion of the accumulated soluble sugar in different seasons, followed by fructose, and glucose. This study would be helpful for better understanding the physiological regulation mechanism and adaptation mode of desert plants.