STUDY ON SEED QUALITY OF CUPRESSUS GIGANTEA UNDER DIFFERENT SEED SETTING PATTERNS

This study took the unique species of Cupressus gigantea in Xizang as the research object, the Cupressus gigantea under the seed setting pattern of cone size and position, crown orientation and position, site type and slope direction.14 indexes of the Cupressus gigantea cone and seed were measured and analyzed, to improve the seed quality, guide the field return, and establish the seed quality evaluation system of Cupressus gigantea.The results showed that: (1) When collecting the seeds of Cupressus gigantea, the mother tree growing on the piedmont slope and sunny slope should be selected first, followed by the terrace, and the larger cones in the south and middle of the crown should be collected first.(2) When returning Cupressus gigantea in the field, it is suggested that the returning site should be the sunny slope of the piedmont slope and the terrace.(3) Germination rate, 1000 grain weight, seed viability, superoxide dismutase (SOD) activity and catalase (CAT) activity could be used as representative indices to establish the seed quality evaluation system of Cupressus gigantea.