Comparative Study On Physiological Characteristics And Identification In?Common Wheat×tall Wheatgrass? F₁

Salinization land in our country about 3460 hm²,qualified forage for windbreak and sand-fixation and improvement of salinization land have made some achievements,including long ear suppress a straw as a forage grass and high-profile promotion and research,but the head suppress a wheat straw fiber,poor palatability and long development period,with nearly a few older ear suppress a hybrid wheat straw and wheat the deepening of research,specul ated that the addition of wheat genome could improve its nutritional quality and make the development cycle is short,make it with patience and the characteristics of high yield,To explore the application potential of?Triticum aestivum×Thinopyrum ponticum?F₁ as perennial grass,did preliminary study for the F₁ plants derived from Triticum aestivum Zhongnong 28×Thinopyrum ponticum on Phenotypes,accumulation of biomass,agronomic traits,photosynthetic efficiency,different planting methods,etc.The results showed:1.Seed phenotypic investigation and analysis showed that the 1000-grain weight and grain width of F₁ were between parents.However,F₁ seed area and grain length were not significantly different from that of parents.Karyotype analysis of Fluorescence in Situ Hybridization of grass F₁ showed that half of the chromosomes from both parents were obtained by in situ hybridization of F₁?F₁:n=56?.2.The study for phenotypic omics at different developmental stages were showed that the F₁ had significantly higher projected area and compactness at tilling,jointing,heading,and flowering stages,caliper length at tilling,jointing,and heading stages,object extent X and object extent Y at tilling and heading stages,but significantly lower mean color of green at tilling and heading stages compared with Thinopyrum ponticum.Additionally,the compactness and mean color green were significantly higher while the object extent X in the F₁ was lower than that in Thinopyrum ponticum at 23 d after first cut.3.The F₁ produced more herbage yield than Thinopyrum ponticum whatever cut for thrice,twice,or once a year in Beijing and Nanpi.Especially for seed planting,the F₁ yielded more than Thinopyrum ponticum by 61.9%?103.5%.Two cuts in a year produced the highest herbage yields for both the F₁ and Thinopyrum ponticum,for which the first cut carried out around June 1st might lead to high yield and good quality.4.The leaf number,lengths of leaf length and width,and fresh weight per plant in F₁ were significantly higher than those in Thinopyrum ponticum at jointing stage,The flowering time of F₁ was significantly earlier than Thinopyrum ponticum.The tiller number,plant height and maximum fresh weight per plant were not significantly different from Thinopyrum ponticum at jointing stage.5.The photosynthetic rate,stomatal conductance,and intercellular carbon dioxide concentration of F₁ were not significantly different from that of Thinopyrum ponticum,but the photosynthetic capacity of leaves was significantly improved?P<0.05?.Either in the field or in greenhouse the content of chlorophyll and carotenoids in the F₁ was significantly higher than that in Thinopyrum ponticum.In addition,the F₁ had higher content of fructose,sucrose,and starch but lower content of glucose around June 1st in comparison with Thinopyrum ponticum.This study showed that F₁ had faster growth,stronger photosynthetic capacity,higher yeild than Thinopyrum ponticum.This showed that F₁ had great application potential as forage,and the most reasonable and efficient planting and harvesting plan was to dividing plants in autumn and cut them twice in the next year.