Germination responses of three desert plants to temperature and water potential

Abstract

Abstract: The hydrothermal model that quantifies seed germination progress affected by temperature and water potential, is one of the important methods in the physiological and ecological researches of seed. Seed germination percentage and germination rates (1/t₅₀) of three desert plants Cleistogenes songorica,Peganum multisectum and Bassia dasyphylla collected from Alashan desert grassland, Inner Mongolia were estimated under the water potential ranging from -2.1 to 0 MPa at 15, 20, 25, and 30℃. The hydrotime (θ_H) and thermaltime (θ_T) were estimated by using the hydrothermal model. Significant positive correlations were observed between the germination percentages of three desert plants and the osmotic potentials (r²=0.54-0.96, P＜0.01), and between the germination rates (1/t₅₀) and the osmotic potentials (r²=0.66-0.95, P＜0.01) except P. multisectum ( of which the germination percentage was less than 50% from -2.1 to 0 MPa at 15, 20, and 25℃). θ_H varied with temperature change (P＜0.05) from 15 to 25℃ appearing P. multisectum＜B. dasyphylla＜C. songorica. And θ_T varied with osmotic potential change from -1.5 to 0 MPa, showing similar order.

CLC Number:

HUANG Wen-da, WANG Yan-rong, HU Xiao-wen. Germination responses of three desert plants to temperature and water potential[J]. Acta Prataculturae Sinica, 2009, 18(3): 171-177.

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