Author(s):

K Nandhini, R Saraswathi, N Premalatha, N Sakthivel and N Kumaravadivel

Abstract: The quality of textile processing depends on the several cotton (Gossypium hirsutum L.) fibre quality traits, such as micronaire value, fibre length, and fibre strength. The objective of this investigation was to identify stable genotype(s) and suitable season for expression of five fibre quality traits among 220 recombinant inbred lines of cotton. This evaluation was done at Department of Cotton, TNAU, Coimbatore during three seasons (kharif 2017-18, Summer 2018 and kharif 2018-19) in randomized complete block design with two replications. Genotype×environment interaction (GEI) was studied using the Additive main effect and multiplicative interaction analysis. Pooled analysis of variance revealed highly significant differences among genotypes, environments and interaction effect for Upper half mean length of fibre, uniformity index, bundle strength and fibre fineness. Principal component 1 for upper half mean length of fibre, uniformity index, bundle strength, elongation percentage and fibre fineness accounted for 67.58, 75.40, 80.30, 81.20 and 74.90 per cent respectively of the total variation. Based on genotype stability index, RIL 120 emerged as stable performer for four quality traits viz., UHML, bundle strength, elongation percentage and fibre fineness. Also, six other genotypes viz., RIL 145,151,74,82,96 and 152 were stable for atleast two quality traits. Based on PC1, AMMI stability value and Genotype stability index, 52 entries were shortlisted for GGE biplot analysis. RIL 134 exhibited the best fibre qualities viz., bundle strength and elongation percentage in E1 season and uniformity index in E3. The genotype RIL 93 expressed its best fibre qualities viz., bundle strength and upper half mean length in E2. So also, the potential of RIL 82 for elongation percentage could be witnessed in both seasons E2 and E3 and for fibre fineness during E1. These genotypes are ideal for multiple traits in same or different seasons. E 1 season (Kharif 2017-18) emerged as representative and discriminating environment for three out of five traits viz., bundle strength, elongation percentage and fibre fineness. Thus the present investigation has led to identification of ideal RI lines for different fibre traits and ideal season for selection and development of improved cotton varieties with good fibre quality.

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