Transmission of pathogenic fungi from seeds to seedlings in cotton (Gossypium hirsutum L.)

Dhaka University Journal of Biological Sciences Pub Date : 2023-07-20 DOI:10.3329/dujbs.v32i2.67681

A. Khatun, S. Shamsi, M. Bashar

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Abstract

Cotton seeds of susceptible variety CB10 were inoculated with nine pathogenic fungi viz., Aspergillus flavus, A. niger, A. tamarii, Colletotrichum gloeosporioides, Curvularia lunata, Fusarium nivale, F. moniliforme, Mucor sp. and Rhizoctonia solani. Seedlings were grown in water agar test tube and in earthen pots. In water agar test, R. solani showed the highest percentage of seed to seedling transmission (35.27%) which was followed by F. moniliforme (31.29%) and A. niger showed the lowest (8.03%) transmission. Germination percentage of control seeds was 90.32% whereas in pathogen inoculated seeds it varied from 58.33 to 89.07%. The seedling mortality percentage was highest in R. solani (46.68%) and lowest in C. gloeosporioides (18.67%). Germination percentage of control seeds in pot was 99% whereas in pathogen inoculated seeds it varied from 43.37 to 84.34%. The seedling mortality percentage was highest in F. moniliforme (48.28%) and lowest in A. niger (19.64%). Percentage of seed to seedling transmission of fungi varied from 17.85% (A. niger) to 46.56% (F. moniliforme). Dhaka Univ. J. Biol. Sci. 32(2): 225-232, 2023 (July)

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棉花致病真菌从种子到幼苗的传播

以敏感品种CB10棉籽为材料，接种了9种致病真菌:黄曲霉、黑曲霉、柽柳霉、炭疽菌、月曲霉、nivale镰刀菌、moniliforme、Mucor sp.和solani Rhizoctonia。幼苗分别在水琼脂试管和土盆中生长。在水琼脂试验中，番茄黑霉的传种率最高(35.27%)，其次是念珠菌(31.29%)，黑霉的传种率最低(8.03%)。对照种子发芽率为90.32%，而病原菌接种种子发芽率为58.33% ~ 89.07%。苗木死亡率以茄茄最高(46.68%)，gloeosporioides最低(18.67%)。对照种子在盆栽中的发芽率为99%，而病原菌接种种子的发芽率为43.37% ~ 84.34%。单株赤霉病菌幼苗死亡率最高(48.28%)，尼日尔赤霉病菌最低(19.64%)。真菌从种子到幼苗的传播率从17.85%(黑曲霉)到46.56%(念珠菌)不等。达卡大学。科学通报32(2):225- 232,2023 (7)

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Dhaka University Journal of Biological Sciences

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