西葫芦杂种一代产量性状优势表现及相关分析

西葫芦杂种一代和亲本产量性状测定分析表明，杂种一代产量性状较其亲本均有不同程度的优势表现，除第一雌花节位、始花期、始收期表现为负向优势外，其余性状均表现为正向优势，不同组合不同性状优势表现不同。性状相关和亲子相关分析表明，单株产量与单株结果数、果实发育速度相关显著，杂种一代大多数性状不同程度的受到亲本的影响。亲子相关分析为利用亲本表现初步预测杂种一代性状表现、杂交制种亲本选择选配和性状改良提供了理论基础。

HETEROSIS PERFORMANCES AND CORRELATION ANALYSIS OF YEILD CHARACT ERS OF SUMMER SQUASH HYBRIDS

The analysis of the yield characters of summer squash hybrids and their parents showed that the hybrids all performed heterosis at different level compared with their parents. Except that node position of the first flower, period from planting to flowering and period from planting to harvesting showed negative heterosis, and all of the other characters showed positive heterosis. But different hybrids and different characters performed differently. Correlation analysis between characters and that between parents and hybrids indicated that the yield of per plant was significantly correlated with fruit number of per plant and rate of fruit growing. The performances of most hybrid characters were affected by their parents at different level. Correlation analysis between hybrids and parents could be used as theory basis for predicting performances of hybrids characters, selecting inbred lines as parents and improving characters of parents.