In order to improve production and breed new broods of bay scallop Argopecten irradians irradians, different-colored orange, purple and white lines were established by two mating methods of self-fertilization and mass...In order to improve production and breed new broods of bay scallop Argopecten irradians irradians, different-colored orange, purple and white lines were established by two mating methods of self-fertilization and mass spawning at a commercial scallop hatchery in spring, 2002. And then larval growth and survival of different lines was compared to test whether there is a relationship between shell color and growth and survival at early developmental stage. Both growth and survival have no significant differences among different experimental larvae of self-fertilization or mass spawning. Results are as following in the order of orange, purple and white shell stock. For the self-fertilization, growth rates of larvae were 6.174, 6.412, and 6.599 μm/d, respectively. Survival rates of larvae at Day 3 were 74.41%, 76.86%, and 82.05%; Day 6 were 49.14%, 65.63%, and 52.79%; and Day 9 were 25.06%, 20.80%, and 26.47%, respectively. For the mass spawning, the growth rates were 7.836, 7.941, and 7.878 μm/d, respectively. Survival rates at Day 3 were 93.05%, 91.95%, and 92.50%; Day 6 were 79.17%, 78.05%, and 82.50%; and Day 9 were 34.72%, 36.67%, and 38.33%, respectively. The absence of any relationship between shell color and growth and survival at the larval stage may be resulted from their common genetic basis.展开更多
Successful reforestation depends on the use of stock material that has a high potential for growth and survival in the environment where it is out-planted. This study is aimed at raising awareness on plant traits that...Successful reforestation depends on the use of stock material that has a high potential for growth and survival in the environment where it is out-planted. This study is aimed at raising awareness on plant traits that are useful in evaluating the reforestation potential of seedlings and cuttings. The authors reviewed relevant literature on the assessment of quality of seedlings and cuttings and on the comparison of field performance of the two stock types. Results indicated that root-collar diameter, shoot height, root mass, number of first-order lateral roots and shoot-root ratio are morphological parameters whereas root growth potential, water relations, photosynthetic capacity and dormancy status are physiological traits that could be used as a basis for rating and comparing the suitability of seedlings and cuttings for reforestation. There is a discrepancy among studies on the field performance of seedlings and cuttings. It is concluded that a combination of morphological and physiological parameters should be used in evaluating the relative value of cuttings and seedlings. In addition, the age of the parent plant of a cutting should be taken into consideration when comparing the reforestation potential of the two stock alternatives.展开更多
基金This work was financially supported by Project of Scientific Innova-tion, Chinese Academy of Sciences (ZKCX2-211).
文摘In order to improve production and breed new broods of bay scallop Argopecten irradians irradians, different-colored orange, purple and white lines were established by two mating methods of self-fertilization and mass spawning at a commercial scallop hatchery in spring, 2002. And then larval growth and survival of different lines was compared to test whether there is a relationship between shell color and growth and survival at early developmental stage. Both growth and survival have no significant differences among different experimental larvae of self-fertilization or mass spawning. Results are as following in the order of orange, purple and white shell stock. For the self-fertilization, growth rates of larvae were 6.174, 6.412, and 6.599 μm/d, respectively. Survival rates of larvae at Day 3 were 74.41%, 76.86%, and 82.05%; Day 6 were 49.14%, 65.63%, and 52.79%; and Day 9 were 25.06%, 20.80%, and 26.47%, respectively. For the mass spawning, the growth rates were 7.836, 7.941, and 7.878 μm/d, respectively. Survival rates at Day 3 were 93.05%, 91.95%, and 92.50%; Day 6 were 79.17%, 78.05%, and 82.50%; and Day 9 were 34.72%, 36.67%, and 38.33%, respectively. The absence of any relationship between shell color and growth and survival at the larval stage may be resulted from their common genetic basis.
文摘Successful reforestation depends on the use of stock material that has a high potential for growth and survival in the environment where it is out-planted. This study is aimed at raising awareness on plant traits that are useful in evaluating the reforestation potential of seedlings and cuttings. The authors reviewed relevant literature on the assessment of quality of seedlings and cuttings and on the comparison of field performance of the two stock types. Results indicated that root-collar diameter, shoot height, root mass, number of first-order lateral roots and shoot-root ratio are morphological parameters whereas root growth potential, water relations, photosynthetic capacity and dormancy status are physiological traits that could be used as a basis for rating and comparing the suitability of seedlings and cuttings for reforestation. There is a discrepancy among studies on the field performance of seedlings and cuttings. It is concluded that a combination of morphological and physiological parameters should be used in evaluating the relative value of cuttings and seedlings. In addition, the age of the parent plant of a cutting should be taken into consideration when comparing the reforestation potential of the two stock alternatives.
