Flowering phenology and flo ral biology in pumpkin cultivars

Phenological events, in particular, flowering phenology and aspects of floral biology help to understand therelationship plants with their pollinators. Thus, this study sought estimate, under semi-arid conditions, the relationshipbetween different genotypes pumpkin or winter squash (Cucurbita moschata Duch.) environment, ofreproductive biology. Four cultivars were evaluated three productive cycles, measuring variables daily flower emergence,stigma receptivity, anthesis time morphometry pistil staminate flowers. The production male flowers washigher than female a higher proportion third cycle characterized by air temperature andlower relative humidity. Among cultivars, ‘Jacarezinho’ ‘Sergipe’ presented highest lowest values flowerproduction, respectively. Female remain open longer stigmas receptive until flowersclose. Considering morphometric data, there is positive association between petal length corolla diameter, andbetween access nectar anther size, difference cultivation conditions.