Heterosis Study of Some Quantity Characters of Squash Cucurbita pepo, L

This study was conducted at Research Altyba station where belongs GCSAR during 2007-2008. by using nine parental lines and their 36 F1 hybrids, were obtained from 9x9 half diallel design. The study included stem, earliness and yield component characters, in order to estimate of hetrerosis compare to the mid parents, the better parent and to the standard hybrid, and determine the superior hybrids advantage to invest in agricultural production and benefit from as well as in breeding program development yield of squash. Heterosis over mid parent was evident in all yield components, The hybrid (IL3XIL6) exhibited (16.89 ، 57.57%) respectively for the ratio pistilate flower % and fruit number per plant, negative heterobeltiosis (-13.71%) was recorded by the hybrid (IL3XIL8)for the number of nodes to first flower, While the hybrid (IL3XIL5) showed maximum positive and significant heterobeltiosis (13.06 %) for ratio pistilate flower%, and the hybrid (IL3XIL6) for fruit number per plant (59.47 %) Whereas the results showed that, four hybrids had positive and high significant standard heterosis for plant yield, the hybrid (IL6xIL7) and (IL3XIL6) had maximum value (32.38, 28.68% ) respectively

Study of the Most Important Morphological and Productivity Characters of the Inbreed Lines of Squash Cucurbita Pepo L.

In this research, nine inbreed lines of squash (Cucurbita pepo, L) have been studied during 2007-2008 seasons. The study contains plant phonological phases, and the most important morphological and productivity characteristics related to fruit yield to evaluate the characteristics of every line and identify the economical lines to use it in the breeding programs. The study showed genetic variation between the groups for some important economic characteristics as (the number of fruits per plant, percentage of female flowers, yield per plant, stem long and number of nodes till the first female flower). The study also showed that the inbreed lines of squash is a rich source of variation and can be use in a breeding program to product squash hybrid. The results appeared also the positive correlation between the productivity and some important economic characteristics, such as percentage of female flowers (r=0.871**), the number of fruits per plant (r=0.976**). Whereas negative correlation with the nodes till he first female flower (r=- 0.494) and internodes long (r=- 0.447). Using cluster analysis, the inbreed lines were classified into 2 distinct classes A and B, Class A contained seven inbreed wreathe class B contained Tow inbreed lines.