Abstract
Abstract The variation of leaf number and area on fruit weight, fruit number and plant yield in relation with environment temperature in three cucumber cultivars (Green Gold and Dharwad native of India and a new cultivars namely Super Dominus) in experimental field of Gorgan university were studied in 2007. In this study, the first flowers after formation of 4.99, 17.74 and 28.5 leaves in Green Gold, Dharwad and Super Dominus appeared, respectively. This obtained results showed that after planting with increase of daily time, leaf number, leaf area and dry weight (g) increased as well. Then with progress of plant growth the amount of heat unit which is required for completing of a leaf, one cm2 leaf area and one gram dry weight decreased. This trend continued till the end of harvesting that was lowest. The results showed that essential heat for fruit set in Super Dominus, Dharwad and Green Gold were 470.5, 485 and 593.25 degree days, respectively. A negative correlation (-0.86) were observed between the number of fruits per plant and their weight. In this research between time of first harvest and fruit number negative correlation (-0.93) observed but the correlation (p<0.01) between time of first harvest and fruit weight was positive (0.91). Despite of difference between leaf area, dry weight and morphological character of this three cucumber cultivars, their total yield were equal, while trend of leaf production (for example leaf number) in different stage of growth and development were similar. The obtained data showed that, leaf number can use as a marker for predicting of occurrence of different stage during cucumber plants development. Key words: Cucumber, Temperature, Leaf number, Leaf area, Dry weight, Yield
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