Root Growth of Forage Crops : 1. Rotation growth of root tips in Zea mays and Lolium multiflorum

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  • 牧草類の根の生長 : 1.根端の首振り生長
  • ボクソウルイ ノ ネ ノ セイチョウ 1 コンタン ノ クビフリ セイチョウ

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Abstract

Crowth behaviour of roots of Z. mays and L. multiflorum (4n) were investigated in growth chamber through a time-lapse motion picture appratus under water culture condition to confirm their dynamic growth. Plants were grown under fluorescent light of 8,000-10,000 lux at plant surface with the daylength of 12 hrs. Water temperatures were controlled at 26±2℃ for Z. mays and 20±2℃ for L. multiflorum. The results are summarized as follows ; 1. Seminal root of Z. mays grew rotating its tip which was considered to be a vector of geoperception and the endogenous rotation growth rhythm. 2. Growth direction of new roots changed from vertical to diagonal in turn from the primary to the laterals to form a domed root system. 3. Roots grew rotating their tips every 6-7 hrs., the diameter of the rotational locus being three times of the thickness of the roots. These movements were observed both in seminal roots and nodal roots, and both in primary roots and branched roots. The direction of the movement was clockwise in Z. mays and the reverse in L. multiflorum and it was not certain whether this movement has a daily rhythm or not. 4. The rotation growth of roots can be elucidated ecologically as a comprehensive adaptation to grow in narrow and stubborn media of soil particles to find the least resistant space among them.

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