Studies On The Reproduction Diversities Of The Dayflower

The dayflower (Commelina benghalensis L.)was the malignant miscellaneous grass extensive to distributes.Its reproduction diversities were 6 types of seeds,3 kinds of reproduction shoots,and 5 kinds of flowers with various biological characteristics. The results were as follows:(1)the 6 types of seeds,i.e. aerial and underground big,medium and small size of seed with various characters in their modalities ,dormancy and germination respectively.(2)the 3 kinds of reproduction shoots, i.e. the aerial reproduction shoot,the earth surface reproduction shoot and the underground reproduction shoot, and the earth surface shoot and underground shoot with no leaf lade, and the underground reproduction shoot with no chlorophylls .(3)the 5 kinds of flowers, i.e. staminate flower,chasmogamous hermaphrodite flower, cleistogamous hermaphrodite flower in the aerial reproductive shoot,and the earth surface cleistogamous flower and the underground cleistogamous flower.(4)the blooming period of the dayflower was about 5 months, with the full blooming period from June to September, and almost 70 days of the flowering peak. the first flower, always staminate flower in the aerial inflorescence, flowered after 30～35min peeping out of the spathe. the chasmogamous hermaphrodite flower blooms ( the second flower ) after the first flowering in 40～45min. the duration of staminate flowering mean 4~5h,the aerial chasmogamous hermaphrodite flower was about 2.5~3.5h. the flowering duration and the flowering peak in rainy and cloudy or rainy day were postponed more 1h than in sunny day.(5)the stigma of the aerial chasmogamous hermaphrodite, usually cross-pollination by some insects such as Sphaerophoria macrogaster, stretched out of the petals before the flower flowered,the type of fertilization of the aerial cleistogamous hermaphrodite flower,earth surface cleistogamous flower and underground cleistogamous flower showed us by the flower pillar tying up to round anther and resulting in self -pollination.(6)ovule-pollen association ratio value(P/O) of the normal plant and clone plant of the dayflower in chasmogamous hermaphrodite flower, cleistogamous hermaphrodite flower, earth surface cleistogamous flower and the underground cleistogamous flower was 5818,3532,558,546 respectively.(7)adopting different nutrient mediums to cultivate pollen grain of the dayflower, the germination ratio is very different for each other . the ratio cultivating in solid nutrient medium is highest.(8)the influence of category of hormone or two factors of hormone category and density occurred together on underground sexual reproduction of the dayflower was pole difference,with the same as the influence of four color plastic membrane on underground reproduction growth of the dayflower.(9)the influence together with the sowing-seed density and the types of seeds on underground sexual reproduction of the dayflower was pole difference, and the prominent or the pole correlation were here between the underground sexual reproduction and the sowing-seed density or the types of seed.(10)8 kinds of the strategies was put forward to prevent the crops from the dayflower .