GENOTYPE SEEDLING AGE INTERACTION FOR HYBRID SEED YIELD OF RICE (Oryza sativa L.)

Abstract

The experiment was carried out in Randomized Completely Block Design (RCBD) during the Boro season 2006-2007 (Mid October to mid May) at Bangabandhu Sheikh Mujibur Rahaman Agricultural University-Gazipur. Alok showed significant bi but its deviation from regression (S²di) invalided its linear prediction. Among the three CMS lines CMS-2 was stable for % OCR due to considerable mean, phenotypic index, regression coefficient near unity (bi ? 1) as well as insignificant deviation from regression (S²di ? 0)  and CMS-1 was highly responsive to seedling ages due to  significant bi and insignificant S²di. Although, Alok showed significant bi but its deviation from regression (S²di) invalided its linear prediction. Maximum out crossing rate was obtained from CMS-2 irrespective of seedling ages. On the other hand 43 days old seedling of CMS-1 gave the maximum out crossing rate. CMS-2 was highly responsive to yield over seedling ages. CMS-1 showed insignificant regression coefficient (bi) indicating stability over seedling ages but deviation from regression (S²di) was significant which invalided its linear prediction. Alok showed lower mean, significant regression coefficient (bi) and insignificant deviation from regression (S²di) indicating responsitive to favourable seedling ages with comparatively lower yield. 43 days old seedlings of CMS-2 gave the maximum hybrid seed production rate.

DOI: http://dx.doi.org/10.3329/bjpbg.v24i1.16995