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Summer squash (Cucurbita pepo L.) is considered one of the most important crop in Cucurbitaceae. It was used as a food for human, as well as in many medical purposes (Majeed and Mahmoud, 1988). Commonly, it exhibits more male flowers than female flowers so its yield comes low (Shafeek et al., 2016). Because of the previous reason, growth regulators may be used in farming to increase the total yield. Gibberellins and auxins are used to encourage the germination of seed, vegetative growth, flowering and fruiting in some vegetable crops (Abduljabbar and Ghurbat, 2010). Many obtainable reports show that high yield can be obtained by using growth regulators (Saleh and Abdul, 1980). Shawket (2005) found that use of low concentrations of IAA on summer squash plants at the stage of 3-4 true leaf led to increase fruit number, fruit yield/ plant and total yield per unit area as compared to control plants. Moreover, plant growth increased by using high concentrations of gibberellins (Bora and Sarma 2006), while it inhibited by using a higher concentration of auxin (Hussain et al., 2010). Thus, only low doses of auxin are effective in growth upgrade (Vwioko & Longe 2009 and Rastogi et al., 2013). On the contrast, Rastogi et al. (2013) found that gibberellin alone at high dose showed some inhibitory effects and it was more effective at low levels.

Effect of Foliar Spray with IAA and GA3 on Production and Protein Synthesis of Two Summer Squash Hybrid Cultivars