Pollen colour

Cotton is king of fibre crops and has economic importance worldwide and new cultivars have to be released continuously to meet the demanding needs of economic market. To meet our requirement broad genetic base is needed which is limited due to continuous usage of common parents for crossing. So the germplasm, advanced breeding lines are to be characterised for variable characters. DUS characters listed by PPV FRA, New Delhi were used for this purpose. The field studies were carried out during kharif 2017-18 at RARS, Lam.

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Oenothera biennis L., commonly known as Evening Primrose as flowers open in the evening. Inflorescence is racemose (spike) and flowering continues for about 3 months. Circular floral nectary of translucent colour are present at the point of attachment of petals and hypanthium. Pollen are triporate, of variable sizes held together by viscin threads. Sepals colour change from green to yellowish green, act as indicator of anther dehiscene in the morning in closed conditions and anthesis in the evening.

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The desi cotton hybrids viz., G.Cot.DH-7 (Sujay x G 27) and G.Cot.DH-9 (4011 x 824) and their parents were characterized using morphological and molecular markers. The desi cotton hybrids and their parents showed variations for morphological characters viz., foliage, leaf shape, leaf hairiness, growth habit, pollen colour, bolls shape and stem hairiness. Based on the distinct morphological characters one can identify true hybrid. A set of 25 RAPD and 19 ISSR were used for molecular characterization of desi hybrids.

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