INFLUENCE OF SOLAR RADIATION AND PHOTOPERIOD ON FLOWER INITIATION OF SEASHORE PASPALUM (PASPALUM VAGINATUM SW.)
Production of seeded cultivars of seashore paspalum is possible but limited by length of growing season in the Pacific Northwest and low yield potential in the southern regions of USA.The timing and quantity of flowers play pivotal roles in the process of seed production.External factors of photoperiod and solar radiation were evaluated for their influences on flower initiation of seashore paspalum.The impact of solar radiation was determined by evaluating flowering habit of 11 genotypes of seashore paspalum in response to radiation levels of 100,41,27,and 13% of the non-shaded control in a greenhouse study.Eighty-nine genotypes from the USDA seashore paspalum germplasm collection were monitored for flowering habit for 15 weeks in a greenhouse receiving the natural photoperiod of Griffin,GA.In the radiation study,few flowers were produced at radiation levels of 27 and 13% of the non-shaded control,while most genotypes flowered readily under the 100% radiation treatment.Only a few genotypes tested flowered in response to the 41% radiation level treatment.Plants receiving weekly cumulative PAR (photosynthetically active radiation) of less than 90.2 mmol m-2 wk-1 did not flower.Flowering response to photoperiod varied greatly among genotypes.Flower initiation for the majority of the monitored genotypes increased dramatically as photoperiod reached 14 h and progressed to the longest photoperiod of 14.4 h.These findings indicate that seashore paspalum behaves as a longday plant with a minimum light intensity of around 90.0 mmol m-2 of weekly cumulative PAR required for flower induction.Information obtained from this work should prove useful in improving the potential for production of seeded cultivars of seashore paspalum.
grass reproduction seed production turfgrass
Na Wang Hazel Y. Wetzstein Brian M. Schwartz Paul L. Raymer
Institute ofPlant Breeding,Genetics,and Genomics Department of Crop and Soil Sciences,TheUniveristy of Georgia,Athens,GA 30602 USA
国际会议
The 12th International Turfgrass Research Conference(第十二届国际草坪学术大会)
北京
英文
319-325
2013-07-14（万方平台首次上网日期，不代表论文的发表时间）