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日本型水稻と日印交雜水稻における 分離種子根の伸長性の比較(I報)
井之上 準,折谷 隆志,金晋鎬 順天大學校 1985 論文集 Vol.4 No.1
日本型水稻20品種, 一印交雜水稻20品種の種子根·分離根を川田らの"改良培地"で培養し,分離根の發育を調査した. 1.分離根の長さは,27℃區では日本型水稻の10.9∼18.0㎝に대??して日印交雜水稻は13.2∼19.7㎝で,兩水稻品種間に著しぃ差異はなかったが,30℃區はでは9.1∼19.0㎝と16.7∼27.3㎝で,日本型水稻して日印交雜水稻の伸長は著しく良好であった. 2.分離根の乾物重は,27℃區ては日本型水稻が0.9∼2.0㎎でなったのに對し,日印交雜水稻は3.2∼5.7㎎, 30℃區では0.9∼2.3㎎に對し,4.2∼10.1㎎で,兩溫度흉にねい て兩品稻群間に明からな差が認られた.なね,この差異は30℃區にねいてより著しか った. 3.日本型水稻と日印交雜水稻の間にみられた分離根の乾物重の差異は,主に分지??根の發育の良否によるもので,特に長さ1∼5㎝の分岐根數に 差異が認られた. 4.上記のよらな分岐根の發育の違いは品種群の特性によるものか,あるいは"改良培地"に對する適應度が異なることによるものかについては不明であり,今後にまちたい. 謝辭:本實驗の遂行にあたり有益な助言をいただいた佐賀大學農學部田中典幸博土に深く 感謝いたします. Based on a culture method of excised root tip reported by Kawata et al.??, this study examined growth of seminal root tips of Japonica type and Japonica-Indica hybrid rices. Throughout the studies, the 1㎝ long root tips to initiate experiments were excised from seminal roots and the two root tips had grown in each flask containing 15ml of the culture solution. They had grown at 27 or 30℃ in the dark for three weeks, until the root growth ceased. Plant materials used were 20 varieties of Japonica-Indica hybrids bred in Korea, 10 varieties of Korean paddy rice and 10 ones of Japanese paddy rice. The following results were obtained. 1. Root length at 27℃ varied from 10.9 to 18.0㎝ in the Japonica type rice and from 13.2 to 19.7㎝ in the Japonica-Indica hybrid rice. At 30℃, it was from 9.1 to 19.0㎝ in the former and from 16.7 to 27.3㎝ in the latter. 2. In the both cultural temperatures of 27 and 30℃, Japonica-Indica hyvrid rice had more number of the well developed branched roots than the Japonica type rice. The dry root weight which seems to represent the root growth was from 0.9 to 2.0㎎ in the Japonica type rice and from 3.2 to 5.7㎎ in the Japonica-Indica hyvrid rice at 27℃, while it was from 0.9 to 2.3㎎ in the frmer and from 4.2 to 10.1㎎ in the latter at 30℃. 3. Excised root growth of the Japonica type rice was better at 27℃, than at 30℃, while in the case of the Japonica-Indica hybrid rice this was reverse.
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Gibberellin(GA₃)處理에 依해서 誘起되는 浮稻의 幼苗에 있어서 節間伸長의 品種間差異
金晋鎬,井之上 準 順天大學校 1984 論文集 Vol.3 No.1
幼苗時에 있어서 浮稻와 非浮稻의 區別 및 浮稻의 節間伸長性에 對한 差異를 判定하는 檢定方法을 探求할 目的으로 GA₃의 葉面撒布에 依해 誘起되는 節間伸長의 位置에 對해서 檢討하였다. 供試材料는 "방글라데시" 産浮稻 181品種, "타이랜드"産浮稻85品種 및 非浮稻101品種이었다. 얻어진 結果를 要約하면 다음과 같다. 1. 第 3~5葉期에 GA₃1~1000ppm을 1回 葉面撒布하여 節間伸長이 誘起되었으나伸長이 誘起된 節間의 最低位置는 GA₃濃度가 낮을수록, 또한 節間伸長性이 낮은 品種일수록 높은 傾向으로 나타난다 2. "타이랜드" 産에 있어서 節間伸長이 良好한 品種과 不良한 品種 또는 非浮稻의 區別은 GA₃1000 또는 100ppm 1回의 葉面撒布處理에 依해서 伸長이 誘起된 節間 最低位置의 差異에 依해서 거의 區別될수 있었으나 節間伸長이 不良한 浮稻와 非浮稻의 區別은 困難하였다. 3. "방글라데시"産의 浮稻는 "타이랜드"産의 浮稻보다 GA₃에 依한 節間伸長의 誘起作用을 强하게 받았다. 따라서 GA₃100ppm의 葉面撒布에 依해서 誘起되는 最低伸長節間位置의 差異에 依해서 兩者를 區別할수 있었다. Internode elongation was induced during the seedling stage by foliar application of gibberellic acid (GA₃, 1-1,000 ppm) in floating rice and non-floating rice. The induction effect of GA₃was stronger in floating rice than in non-floating rice. Comparing with Bangladesh floating rice with Thai floating rice, the induction effect was generally stronger in the former than in the latter. In each of both floating rices, it was stronger in the varieties which have good elongation ability than in those with inferior elongation ability. But, the promotion of elongation of both leaf sheath and leaf blade by GA₃did not differ among Bangladesh floating rice, Thai floating and non-floating rices.
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