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Samaru Journal Of Agricultural Education

Year: 2017|   Volume No: 7|   ISSN: 0794 – 7860|   Page No: 109


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Title:  PHENOTYPIC AND GENOTYPIC CORRELATIONS FOR LEAF ROLLER (SYLEPTA DEROGATA) RESISTANCE AND AGRONOMIC TRAITS IN INTRA AND INTER-SPECIFIC COTTON CROSSES

YAHAYA, A.I., ADO, S.G., ISHIYAKU , M.F., ONU, I., MOHAMMED, M.S., BUGAJE, S.M., AND USMAN, A.

DEPARTMENT OF PLANT SCIENCE, INSTITUTE FOR AGRICULTURAL RESEARCH (IAR), AHMADU BELLO UNIVERSITY SAMARU ZARIA- NIGERIA

ABSTRACT

 Correlations of leaf roller resistance traits and yield components are important for the selection of promising parental and segregating populations. Hence, the objective of this research was to estimate the genotypic and phenotypic correlations of leaf roller resistant traits and yield components in inter and intra-specific cotton crosses. Field screening of seven Nigerian commercial cotton varieties under natural field infestation was done for two consecutive years in order to determine the level of resistance to cotton leaf roller, Sylepta derogata. SAMCOT 12 (Gossypium barbadense) was the most susceptible to leaf roller infestation while, SAMCOT 10 (Gossypium hirsutum) and CL07 were resistant. The resistant line CL07 was then crossed to SAMCOT 10(SAMCOT 10 x CL07) and SAMCOT 12 (SAMCOT 12 x CL07) thereby resulting in intra-specific cross and inter-specific cross, respectively. The F1s were advanced to F2s under irrigation. Backcrosses of the F1s to their respective parents were generated. Evaluations of the parents, F1s, F2s and backcrosses were carried out in the field under pesticide sprayed condition. Phenotypic correlations revealed highly significant positive association of seed cotton yield with number of bolls per plant (rp = 0.908**) and leaf area (rp = 0.820**), while significant association was observed with lint percentage (rp = 0.430*). However, plant height was significantly negatively correlated with number of monopodial branches per plant (rp = -0.348*) and number of infested plants at 50 DAS (rp = -0.356*). Correlation coefficient between seed cotton yield and plant height (rg = -0.694**) was negative and highly significant. Plant height and number of bolls per plant (rg = 0.371*), recorded significant positive correlations at 5% level. Positive genotypic correlation between number of bolls per plant with seed cotton yield (rg = 0.860**) revealed the importance of this trait in determining yield.

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