Studies on the Seed Germination of Palms

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  • ヤシ類種子の発芽に関する研究 (第6報)
  • ヤシ類種子の発芽に関する研究-6-ココヤシ,ソテツジュロおよびサトウナツメヤシについて
  • ヤシルイ シュシ ノ ハツガ ニ カンスル ケンキュウ 6 ココヤシ , ソテツジュロ オヨビ サトウナツメヤシ ニ ツイテ
  • ヤシ類種子の発芽に関する研究-5-コガネタケヤシ,トックリヤシモドキおよびナツメヤシについて
  • ヤシルイ シュシ ノ ハツガ ニ カンスル ケンキュウ 5 コガネタケヤシ , トックリヤシモドキ オヨビ ナツメヤシ ニ ツイテ
  • VI. On <i>Cocos nucifera</i> L., <i>Phoenix humilis</i> ROYLE <i>var</i>. <i>hanceana</i> BECC. and <i>Phoenix sylvestris</i> ROXB
  • ココヤシ, ソテツジュロおよびサトウナツメヤシについて

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Experiments on seed germination of some palms (Cocos nucifera, Phoenix humilis var. hanceana, and P. sylvestris) were carried out during 1968 to 1971.<br>(1) The fruit of Cocos nucifera has a hard endocarp which is surrounded by the thick fibrous mesocarp. However, endocarp is slightly thin around the germination pore. The uppermost part of cotyledon remains inside the seed after germination and absorbs nutrients. Then, it grows to fill up the cavity of the seed. On the other hand the plumle and radicle, which escape from the hard inner coat, break the exocarp after the growth in the fibrous layer of the mesocarp. The distance from the coleoptile enclosing the growing point to the haustorium body remaining in the seed is very short. The germination process of the other two Phoenix species is similar to that of Cocos nucifera, but the cylindrical coleoptile lies at a certain distance from haustorium body.<br>(2) 80% germination was the maximum at 35°C and 60% at 30°C in Cocos nucifera. And the maximum germination was 92% and 80% at 30°C in Phoenix humilis var. hanceana and P. sylvestris respectively.<br>(3) The optimum temperature was 30 to 35°C for the seed germination of Cocos nucifera and Phoenix sylvestris, while it was 30°C for P. humilis var. hanceana.<br>(4) The minimum number of days to the germination was 107, 25 and 15 in Cocos nucifera, Phoenix humilis var. hanceana and P. sylvestris, respectively.<br>(5) The most preferable medium for seedage was vermiculite or sand in Phoenix humilis var. hanceana. However, there was no difference among the mediums for seedage in P. sylvestris.

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