Genetic Analysis of Subgynoecious in Watermelon ( Citrullus lanatus) A New Subgynoecious and Chilling Tolerant Bitter Gourd Cultivar‘Xiuyu 1’ A New Subgynoecious and Chilling Tolerant Bitter Gourd Cultivar‘Xiuyu 1’ Genetic Analysis of Subgynoecious in Watermelon ( Citrullus lanatus)