人爲倍數性林木에 關한 硏究 Ⅷ Pinus banksiana 의 Colchitetraploid의 外部形態에 對하여

Studies on artificial polyploid forest trees Ⅷ. On morphological characteristics in colchitetraploids pinus densiflora

本 實驗은 種子 colchicine 處理로 獲得된 11年生 4倍性 P. banksiana에 對하여 染色體數의 確認을 하고 外部形態的 持性을 調査하여 다음과 같은 結果를 얻었다. (1) 生長은 4倍性의 5個體 共히 不良하고 一般的으로 針葉은 短小하고 肥厚하였다. (2) 氣孔의 孔邊細胞으 크기는 2倍體에 比하여 18% 增大하였다. (3) 花粉은 氣囊이 退化한 것과 氣囊의 數가 3個 있는 異常花粉 등은 觀察할 수 있었으며 크기는 2倍體에 比하여 16% 可量增大하였다.

In order to induce useful auto- and allo-polyploids, in the present study, cytological and morphological characteristics of eleven year old tetraploids Pinus banksiana, which were obtained from the seeds treated with colchicine, were observed as follows: (1) The number of chromosomes in the somatic cells was 2n=48, indicating atetraploid. (2) Growth performance of all the five individuals was poor and their needles were short and thickened. (3) The size of guard cells of stomata increased 18% compared to that of guard cells in the normal 2n plants. (4) Abnormal pollen grains which were degenerated in wings or which had three wings were found and the size of pollen grains increased about 16% compared to the pollen grains of 2n plants.