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47
低温条件下におかれたユリで頻発する葉脈間クロロシスへの根の形成
不良の関与
深澤拓也1 ・安井俊樹1 ・赤堀真子2 ・北村嘉邦1
信州大学大学院総合理工学研究科
信州大学農学部
本研究では，シンテッポウユリの変異体である‘グリーンリリアルプ’
‘アルプ’
）をモデルとして，多くの
植物種で認められる低温条件下で起こるクロロシスと根の形成不良との関係を調査した．長野県の生産農家へ
の聞き取りによると，
‘アルプ’は変異前のシンテッポウユリと比較して，春に葉脈間クロロシスが多発し，
葉脈間クロロシスを発症した株では健常株と比較して，根の形成量が少ないという．本研究では，まずこの現
象を確認した．2016年11月から2017年₄月にかけて，暖房温度を10 ˚C に設定した加温ハウスで管理したシン
テッポウユリと‘アルプ’との間で葉脈間クロロシスの発生程度を比較した．その結果，調査した₃反復のす
べてでシンテッポウユリと比較して‘アルプ’で葉脈間クロロシスの発生程度が有意に高かった．特に，12月
下旬に定植し，₃月下旬にクロロシスの発生程度を評価した‘アルプ’で葉脈間クロロシスの発生程度が最も
高く，発生程度の値は約4.1であった．
‘アルプ’の健常株と葉脈間クロロシスの発生株との間で根の形成量を
比較したところ，前者と比較して後者で茎出根と底出根共に形成量が有意に少なく，健常株ではそれぞれ乾物
重が約260 mg，約780 mg であり，葉脈間クロロシスの発生株ではそれぞれ約60 mg，約240 mg であった．以
上より，春に‘アルプ’で起こる葉脈間クロロシスの多発には，低温による根の形成不良が関与すると考えた．
この仮説を検証するために，25／10 ˚C（昼／夜）および15-19 ˚C／10 ˚C（昼／夜）で‘アルプ’を管理し，葉
脈間クロロシスの発生程度，葉での総クロロフィル含量および底出根の形成量を比較した．15-19 ˚C／10 ˚C
区では25／10 ˚C 区と比較して，葉脈間クロロシスの発生程度が高く，25／10 ˚C 区では0,15-19 ˚C／10 ˚C 区で
は約0.7であった．しかし，両者の間で有意差は認められなかった．15-19 ˚C／10 ˚C 区では25／10 ˚C 区と比
較して，葉での総クロロフィル含量および底出根の形成量が有意に少なかった．25／10 ˚C 区と15‒19／10 ˚C
区のそれぞれで，葉での総クロロフィル含量はそれぞれ約646 μg･g FW‒1，約540 μg･g FW‒1 であり，底出根
の形成量はそれぞれ約2040 mg，約1080 mg であった．以上より，‘アルプ’での葉脈間クロロシスの発生には，
低温に起因する根の形成不良が関与すると考えられた．また，多くの植物種で認められる低温条件下でのクロ
ロシスの発生は，根の形成不良に起因することが強く示唆された．
キーワード：環境要因，‘ グリーンリリアルプ ’，クロロフィル含量，根圏温度，冬季
...
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