Tree seed quality testing of Dalbergia cochinchinensis Pierre
2002
Jutitep Bhodthipuks(Royal Forest Department, Bangkok (Thailand). Forest Research Office. Silviculture Research Division)
Some physical and physiological characteristics of Dalbergia cochinchinensis seeds collected from 4 soures in Thailand. It was found that seed length, width, thickness, weight, and seed germination showed highly significant differences within seed source, but there were no significant differences among seed sources. Seed length was found to be the most effective parameter to determine seed weight rather than seed width and seed thickness. On the other hand, coefficients of determination (r sup 2) of some physical characteristics of seed such as seed length and seed weight to seed germination showed high variation due to seed quality of individual trees. Light brown coat seeds gave higher germination than dark brown coat seeds for all individual trees. There were no significant differences in the germination responses of D. cochinchinensis after being subjected to various seed pretreatments and temperature conditions (30 deg C, 30 deg C/25 deg C and ambient dondition). When comparing seed sources in each temperature condition, it was found that seeds from Saraburi source gave the best germination capacity for all temperature conditions. It was found that the optimum temperature for germination of D. cochinchinensis was near 30 deg C. When comparing the effect of storage on the total germination and abnormal germinants, it was discovered that the seeds from Mahasarakam and Sakonnakorn sources showed higher rate of deterioration with reduced total germination and increased abnormality in germinants than those from Saraburi and Surin sources after 5-month storage at ambient condition.
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