Limits of parental divergence for the occurrence of heterosis through morphological and AFLP marker in chilli (Capsicum annuum L.)

作者：Krishnamurthy S L^*; Rao A Mohan; Reddy K Madhavi; Ramesh S; Hittalmani Shailaja; Rao M Gopinath

来源：Current Science, 2013, 104(6): 738-746.

• AFLP
• chilli
• genetic diversity
• heterosis

The present study was undertaken to assess the morphological and amplified fragment length polymorphism (AFLP) marker-based genetic diversity, to estimate mid-parent heterosis and to study the possible limits of the parental divergence for the occurrence of heterosis for yield and its contributing traits in chilli hybrids. Five CMS B lines and 30 testers were used for morphological (9 traits) and AFLP (8 primer combinations) marker-based genetic divergence analysis. One hundred fifty hybrids were synthesized through line x tester (5 x 30) mating design and were used to estimate the mid-parent heterosis for nine characters. More than 50% of hybrids showed significant mid-parent heterosis for both green and red fruit yield per plant. The nonlinear regression revealed intermediate parental divergence for the occurrence of higher frequency of heterotic crosses and extreme genetic divergence for occurrence of less heterotic crosses for green and red fruit yield per plant. Thus, the parental divergence should neither be too small nor very large for realizing higher frequencies of heterotic crosses in both green fruit yield per plant and red fruit yield per plant. It is worthwhile to involve parents with intermediate divergence than involving parents with extreme divergence to recover higher frequencies of heterotic hybrids for both green fruit yield per plant and red fruit yield per plant.

• 出版日期2013-3-25