Evaluation of Wet Endurance of Genus Lolium

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  • TASE Kazuhiro
    Hokuriku National Agricultural Experiment Station
  • KOBAYASHI Makoto
    Hokuriku National Agricultural Experiment Station:(Present office)Okinawa Branch, Tropical Agriculture Research Center

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  • イタリアンライグラス(Lolium multiflorum LAM.)を中心としたLolium属品種・系統の耐湿性の評価
  • イタリアンライグラス Lolium multiflorum Lam.オ チュウ

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Four technological assessments were conducted as fundamental study for development of selection method on the breeding of Italian ryegrass (Lolium multiflorum LAM.) for wet endurance. The results obtained are summarized as follows : 1. Evaluation of wet endurance by principal component analysis (Expt 1) : The principal component analysis was applied to find out important component using nine characteristics data of seedlings of twenty cultivars and strains after flooding treatment. The first principal component was considered as a good indicator of wet endurance. High correlation was recognized between the scores and dry matter yield on lysimeters under flooding condition. Therefore it was concluded that the first principal component score is quite suitable for the evaluation of both wet endurance and dry matter yield. 2. Simple method for the evaluation of wet endurance (Expt 2) : The degree of rooting on soil surface was correlated significantly to the first principal component score in the flooding experiment. A high correlation was also observed between the degree of rooting and relative dry matter weight (flooded/unflooded) of upper layer's roots after flooding treatment. Thus, the degree of rooting was considered as a more simple method than the component analysis using many variables for the evaluation of wet endurance. 3. Change of ventilating system of root after flooding treatment (Expt 3) : To examine relations between wet endurance and development of aerenchyma, intercellular space of root tissue was observed under a microscope. Cultivars classified into wet tolerant group by principal component analysis showed increase of the proportion of intercellular space in flooding condition. 4. Changes of alcohol dehydrogenase (ADH) isozyme after flooding treatment (Expt 4) : Five bands were detected on the zymograms of ADH extracted from root of non-flooded seedlings, while two bands with lower molecular weight than above mentioned bands were recognized only in flooded seedlings. These changes of ADH isozyme activities may be important in the physiological adaptation to wet conditions.

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