Genetic Diversity And Super Quality Germplasm Selection Of Natural Dactylis Glomerata L.

Thirty-five accessions of wild Dactylis glomerata L.,among which thirty-three are from the main production area in China and two are from abroad, were collected and tested both in assessment of genetic diversity and in germplasm appraisal at morphological, productive, physiological and molecular levels by a comparison with two representative varieties D. glomerata L.CV. Baoxing and D. glomerata L. CV. Anba. The main results show that:1. Natural D. glomerata produces rich morphological diversity. Among the 19 observed properties, morphological variances most significantly occur in 1000- seed weight, ranging from 0.28g to 1.12g at a variance coefficient of 42.91%. Moderately significant variances were tested in flag leaf length and inflorescence shape with a variance coefficient of 30.76% and 30.18% whereas no significant variances occur in features of plant height, internode diameter, with a variance coefficient of 13.3% and 12.9%.The erected-inflorescence accessions can be more productive with better developed generative organs, but very poor for the bent-inflorescence ones. Accordingly, three germplasm types can be formulated as two erected-inflorescence types and one bent-inflorescence type, and the erected-inflorescence types can be more potential for productive application.2. Diversities were also tested to exist significantly in growth properties. The early-maturing accessions reach their growth peak before jointing date at the highest growth rate of 1.93cm/d. The generation finishes within 249d, among which 199 days on trophic growth and 50 days on reproduction. In contrast, the slow-growing types are extremely slow at growth and no reproductive development can be found in the test except for their trophic building. As for the late-maturing accessions, their growth can be finished within 289d, among which 251 days are for trophic growth and only 38 days for reproduction. The moderate-maturing types feature between the early-maturing and late-maturing. Basically, the plant height of the late-maturing is significantly higher than those of the early-maturing and the moderate-maturing type (p<0.05=.3. According to tillering speed and totle numer of tillers, tested D. glomerata L. can be divided into three groups, among which, the highest tilling accessions can be investigated between next March and April. At the peak tilling time, tillage of a single plant...