[Research of seedling quality grading of Dendrobium nobile].
OBJECTIVE
To establish the seedling quality grading standard of Dendrobium nobile.


METHODS
Height, stem thickness and stem nodes of seedlings (test-tube seedling and cutting seedling) from Chishui city Guizhou province were tested. Through statistical analysis, the key indicators for seedling quality grading were defined.


RESULTS
Height and the number of cluster were the primary indicator of test-tube seedling; Height and the number of buds were the primary indicator of cutting seedling.


CONCLUSIONS
The grade test-tube seedling quality of each grade should reach the following requirements: for the first grade seedlings height > or = 17cm, the numbers of cluster > or = 3; For the second seedling height 11 -17cm, the numbers of cluster > or =2. The grade cutting seedling requires the first grade seedlings height > or = 12cm, the numbers of buds > or = 3; The second grade seedling height 6 - 12cm, the numbers of cluster > or = 2. Seedlings those can hot reach the second grade requirements are defined as unqualified seedlings.
Yunnan Branch, Institute of Medicinal Plant, Chinese Academy of Medical Sciences, Peking Union Medical College, Jinghong 666100, China. tl_128@163.com
Ling
L
Tang
Li-Xia
LX
Zhang
Yun-Qiang
YQ
Wang
Chun-Yong
CY
Yang
De-Ying
DY
Tang
D000704:Analysis of Variance; D001699:Biometry; D031667:Dendrobium / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development*; D010946:Plants, Medicinal / Q000033:anatomy & histology / Q000145:classification / Q000254:growth & development; D011786:Quality Control; D036226:Seedlings / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development*; D012639:Seeds / Q000254:growth & development / Q000502:physiology; D046509:Tissue Culture Techniques / Q000379:methods