Germination response to temperature of ten desert plant species

doi:10.11686/cyxb2019101

Abstract

Abstract: Temperature is considered one of the most important environmental factors governing seed germination and seedling emergence. Therefore, knowledge of the seed germination response to temperature has is an important criterion when determining the appropriate planting time and predicting the seedling emergence of species in the field. Seeds of Ammopiptanthus mongolicus, Artemisia sphaerocephala, Astragalus adsurgens, Caragana intermedia, Caragana korshinskii, Cleistogenes songorica, Haloxylon ammodendron, Hedysarum fruticosum, Hedysarum scoparium and Zygophyllum xanthoxylum, were used in this study. The dynamics of seed germination were determined over a range of constant temperatures from 5 to 40 ℃ at 5 ℃ intervals. The temperature thresholds (Tb, To, Tc, θ_T) of ten desert plant species were calculated according to the thermal time model. The results showed that: in the test species, the optimum temperature (To) was 33.7 ℃ for C. songorica, 28.3 ℃ for A. mongolicus and for other species ranged from 17.4 to 24.9 ℃. The base temperature was 0.3 ℃ for A. adsurgens, followed by H. ammodendron at 1.9 ℃, with other species ranging between 6.7 and 15.0 ℃. The ceiling temperature was 45.3 ℃ for H. ammodendron, with C. songorica being 43.9 ℃, A. adsurgens 43.3 ℃, A. mongolicus 39.7 ℃, and the other species ranging from 25.0 to 34.2℃. The largest germination temperature ranges were 1.9 to 45.3 ℃ for H. ammodendron and 15.0 to 30.0 ℃ for Z. xanthoxylum. The thermal time requirement for germination, from lowest to highest, was: A. mongolicus (79 ℃·d), H. ammodendron (94 ℃·d), A. sphaerocephala (114 ℃·d), H. fruticosum (127 ℃·d), Z. xanthoxylum (132 ℃·d), H. scoparium (177℃·d), A. adsurgens (184 ℃·d), C. intermedia (217 ℃·d), C. korshinskii (302 ℃·d), C. songorica (334 ℃·d).

Key words: desert plant species, seed germination, thermal time model, temperature thresholds, thermal time value

BAI Meng-jie, TAO Qi-bo, HAN Yun-hua, WANG Yan-rong. Germination response to temperature of ten desert plant species[J]. Acta Prataculturae Sinica, 2019, 28(12): 53-62.

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