Biometrical characteristics of R2 generation of anther-derived pepper (Capsicum spp.) plants

Abstract

Eight anther-derived DH lines of pepper hybrids: two red-fruited (AP14, AP15) and two yellow lines (AP25 and AP32) of C. annuum (ATZ1 × PO)F₂, two lines of (C. frutescens × C. annuum)F₁ (FA1, FA2), and two of (C. frutescens × C. chinense)F₁ (FCH2, FCH3), were studied regarding important morphological plant and fruit characters. C. annuum breeding line 'ATZ1' was used as a standard. The following traits were evaluated: total fruit yield, fruit weight, weight of placenta with seeds, technological matter, pericarp thickness, extract content, dry matter content, weight and number of seeds per fruit. The level of homogeneity within the DH lines was analysed with a one-way analysis of variance, additionally the values of coefficient of variation (CV) were determined for the tested plant characters. The highest phenotypic uniformity was noted for the red-fruited lines obtained from anthers of (ATZ1 × PO)F₂ and for the DH lines of (C. frutescens × C. annuum) F₁, while the least uniform were FCH2 and FCH3 lines of (C. frutescens × C. chinense)F₁. The DH lines AP14 and AP15, as well as FA1 and FA2 were phenotype homogeneous in respect of weight of fruit, technological matter, pericarp thickness and extract content. For these parameters, also the values of CV were the lowest. Statistically significant interline polymorphism between the androgenic lines of the same origin was detected among the lines of C. annuum (ATZ1 × PO)F₂.