根域制限がイチゴ (Fragaria × ananassa Duch.) の生育および根系形成に及ぼす影響 [in Japanese] Root Confinement Effects on Strawberry (Fragaria × ananassa Duch.) Growth and Root System Formation [in Japanese]
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種子繁殖型の四季成り性品種"エラン"を用いて, 根域制限がイチゴの根の生長および根系形成に及ぼす影響を検討した. 4月上旬に本葉3枚苗を3L, 1L, 0.2L容量の生分解性不織布ポットに定植した後, かん水同時施肥で管理し, 生育, 収量およびいくつかの根系特性を評価した. 葉柄長を除く地上部, クラウンの生育および収量には根域制限の影響は認められなかった. ルートモデルによりイチゴの根系は太根群と細根群に大別された. 根重は培地容量が少ないほど減少したが, 根長, 根表面積, 白色根の呼吸速度では培地容量による差は小さく, 根長密度は培地容量が小さいほど大きかった. イチゴは, 活発な不定根, 側根の形成・生長能力を持つことで, 根域制限下においても高い養水分吸収能力を維持し, 生産力が低下しにくい.
Effects of root confinement on strawberry root growth and root system formation were studied using a seed-propagation type, ever-bearing cultivar 'Eran'. In early April 2005, seedlings with three true leaves were transplanted into 3 L, 1 L, or 0.2 L pots made of biodegradable non-woven fabric. Each plant was given 300 ml nutrient solution daily using a drip fertigation system. The growth of tops and roots, the respiration rate of white roots, and root length were investigated during June-July. Leaf growth except for that of petioles, rhizome growth, and yield were not affected by root confinement. Roots were classified into thick and fine root groups. The root weight was less for plants in smaller pots. However, the root length, root surface area, and the respiration rate of white roots were not clearly affected by root confinement; root length density was greater for plants in smaller pots. Through vigorous growth and formation of adventitious and lateral roots, strawberries were inferred to maintain active uptake of water and nutrients, which could reflect on the productivity, despite root confinement.
- Root Research
Root Research 17(3), 99-104, 2008-10-10
Japanese Society for Root Research