Seed-borne fungi infection of Siberian wildrye: Effects on seed germination and seedling growth

doi:10.11686/cyxb20150212

Abstract

Abstract: We investigated seed-borne fungi in Siberian wildrye seed samples collected from Qinghai in five different harvest seasons (S₁ to S₅) and tested the effects of fungal infection on seed germination and seedling growth. Seed germination ranged from 56%to 80%. S₂ had the highest seed germination (80%), significantly higher than S₁ and S₅ (P<0.05).The fungal infection rate of seed samples varied from 24% to 38% and declined with the extension of storage time.S₅ had the highest infection rate of 38%, significantly higher than all other samples (P<0.05).17 fungal species from 15 genera were identified; the isolation rate ranged from 0.25% to 8.75%. Penicillium sp. and Aspergillus sp. were the most common seed-borne species found and were isolated in all seasons. Pathogenicity tests showed that Fusarium avenaceum,F. monilifome,Fusarium sp.1,Drechslera sp. and Bipolaris sp. were the most pathogenic fungi, significantly reducing seed germination and seedling growth (P<0.05). Alternaria alternata significantly reduced seedling growth but did not affect seed germination. Pithomyces sp.,Aspergillus sp. and Bipolaris sp. significantly prolonged the mean seed germination period, while Fusarium avenaceum significantly shortened it (P<0.05).

CHEN Tao, NAN Zhibiao. Seed-borne fungi infection of Siberian wildrye: Effects on seed germination and seedling growth[J]. Acta Prataculturae Sinica, 2015, 24(2): 96-103.

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