西葫芦单性结实品种的性状研究

在生长势和整齐度等方面,单性结实品系P的生长势略弱于杂交组合,以早青、阿太2个主栽品种为最好,同时C1(P×7)组合也表现出了较强的杂种优势,C1的生长势明显强于单性结实品系与7号品系,功能叶片数多,株高则较双亲都小,开展度和叶色介于二者之间.各品种或品系的叶色由绿色到深绿,此外有无白斑也是品种的特征之一,白斑为显性性状.单性结实品系P生殖生长弱于主栽品种.早青与阿太以及C1、C2(P×5)的表现均较好.果皮色则有较大差异,单性结实品系P为白色.C1果皮为黄绿色,同时说明果皮色绿色对白色为不完全显性.对各品种(系)的丰产性进行了调查表明,单性结实品系P的单株产量达1.30kg,折合单产达25995kg/hm2,早期产量达0.52kg/株,仅次于C1.单性结实品系与其他品种相比,早熟性能良好,早期产量较高.第1雄花开花期一般提前1～5d,雄花始花期提前1～8d,雄花盛花期一般也提前1～7d;第1雌花开花期提前3～5d,雌花始花期提前2～13d,雌花盛花期一般提前7～12d.

Observations and Studies on the Parthenocarpic Characteristics of Summer Squash

The experiment indicated the parthenocarpic summer squash(Cucumis Pepo L.)cultivars were weaker to some extent than the hybrids in growth vigor and homogeneity,among which the Zaoqing and Atai were the best,while the hybrid C 1 performed good as well.The growth vigor of C 1 was obviously stronger than its parents,which showed there were many more numbers of functional foliage increasing and shorter plant height than those of both parents,and extension degree and foliage color were between two parents.The color of each cultivars and hybrids was various from the green to dark green.As an addition,the existence of vitiligo can also act as characteristics of cultivars or hybrid because the vitiligo was the dominant compared with non-existence of vitiligo.The prolificness of cultivars and hybrids was investigated individually.The yield of the parthenocarpic cultivars was not lower than that of others,and the average yield of a single individual was 1.30?kg.The yield per hectare was 25?950?kg,but the yield in early stage was 0.52?kg lower than that of C 1.The maturity was good compared with the other varieties and hybrids.The date of the first pistillate flower was 3～15 days in advance,the date of beginning of pistillate opening was 2-13?days in advance and the date of highlight of pistillate opening was 7-24?days in advance.