辽东栎幼苗生长对种子大小和子叶去除处理的响应

该文在温室内盆播条件下,设置不去除子叶(对照)、去除1/4子叶(轻度子叶去除)、1/2子叶(中度子叶去除)和3/4子叶(重度子叶去除)4个处理,研究了种子大小和子叶去除处理对辽东栎幼苗生长及其形态学可塑性的影响.结果表明:(1)大种子幼苗株高、基茎、叶片数、单株叶面积、总干质量和根冠比在所有处理均大于小种子幼苗,除株高...

Response of seedling growth of Quercus wutaishanica to seed size and cotyledon excision

Four treatments of cotyledon excisions(no cotyledon excision, excisions of 1/4, 1/2 and 3/4 cotyledon, defined as control, light, medium, and high cotyledon excisions, respectively)were conducted to investigate the effects of seed size and different cotyledon excisions on the growth and morphological plasticity of Quercus wutaishanica seedlings planted in greenhouse pots. The results were as follows:(1)The shoot height(SH), basal stem diameter(BSD), leaf number(LN), leaf area per plant(LAPP), total dry mass(TDM), and root-shoot ratio(RSR)of Q. wutaishanica seedlings germinated from large seeds were higher than those of seedlings from small seeds in all treatments of cotyledon excision. There were significant differences in all above parameters, with the exception of SH, among seedlings from large and small seeds, on which cotyledons were lightly excised(P<0.05). Moreover, TDM of the former was significantly higher than that of the latter for the medium cotyledon excision(P<0.05). Also, higher specific leaf area(SLA)and specific root length(SRL)of seedlings from large seeds than those from small seeds were observed in all treatments of cotyledon excisions, while the specific shoot length(SSL)was detected in reverse.(2)With the intensity of cotyledon excision increasing, SH, BSD, LN, LAPP and TDM of seedlings from both large and small seeds appeared a trend of decline. SH, BSD, LN and LAPP of seedlings emerged from high cotyledon excision seeds were significantly lower than those of seedlings from control and light cotyledon excision seeds(P<0.05). Higher sensitivity to cotyledon excision was found in seedlings from small seeds than from large seeds, and SH, LN, LAPP and TDM of seedlings originated from small seeds, of which cotyledons were mediumly excised were also lower than those of seedlings from control seeds(P<0.05). RSR increased with the intensity of cotyledon excision increasing, and they were markedly higher in seedlings from seeds, regardless of whether they were large or small sized, mediumly and highly excised than those in seedlings from control and light cotyledon excision seeds(P<0.05).(3)With the intensity of cotyledon excision increasing, SLA and SRL gradually increased, while SSL of seedlings emerged from large seeds continuously decreased and the seedlings emerged from small seeds whose cotyledons were lightly excised had the maximum of SSL.