Science Links Japan | Effects of Light Intensity during Acclimatization on Antioxidative Enzyme Activities and Growth in Mericlone Plantlets of a Cattleya Hybrid

Effects of Light Intensity during Acclimatization on Antioxidative Enzyme Activities and Growth in Mericlone Plantlets of a Cattleya Hybrid

Accession number;06A0413495

Title;Effects of Light Intensity during Acclimatization on Antioxidative Enzyme Activities and Growth in Mericlone Plantlets of a Cattleya Hybrid

Author; LI YOUHONG (South Central Forestry Univ., Changsha, Chn) IMAI KEN (Gifu Univ., Gifu, Jpn) ONWONA-AGYEMAN SIAW (Gifu Univ., Gifu, Jpn) OHNO HAJIME (Shizuoka Univ., Shizuoka, Jpn) MATSUI SHUICHIRO (Gifu Univ., Gifu, Jpn)

Journal Title;Journal of the Japanese Society for Horticultural Science

Journal Code:F0626A

ISSN:0013-7626

VOL.75;NO.3;PAGE.243-248(2006)

Figure&Table&Reference;FIG.3, TBL.1, REF.20

Pub. Country;Japan

Language;English

Abstract;Mericlone plantlets of Brassolaeliocattleya Sanyan Ruby 'Shinmei' with one leaf transplanted into pots with sphagnum moss were acclimatized at 230 (high), 83 (intermediate) and 50 .MU.mol m'-2' s'-1' (low light intensity) for 4 weeks in growth cabinets under a 16-h photoperiod and 25.DEG.C.. The main objective was to determine the antioxidative enzyme activities and the growth of the potted mericlone plantlets. At the intermediate light intensity superoxide dismutase (SOD) that disproportionations superoxide to hydrogen peroxide, and catalase (CAT) reduced activities in both leaves and roots. However, CAT in roots increased 6h after the onset of acclimatization and then remained constant. Ascorbate peroxidase (APX) activity with participation of ascorbate in roots and CAT activity in roots did not changed significantly. At the high light intensity, activities of SOD and APX of leaf and of the three antioxidative enzymes of roots increased. After 4weeks, foliar SOD and APX activities were markedly higher under the high light intensity than under the intermediate one. Under the low light intensity, these three enzyme activities in both leaves and roots increased. Activities of foliar SOD and CAT decreased after 2weeks and then remained constant as the activity of APX increased. The three enzymes in the roots maintained higher activities under the low light intensity than under the intermediate one; CAT activity declined rapidly 2weeks later and reached a level similar to those at the intermediate light intensity. After 4 months of acclimatization, leaves under the high light intensity were shorter than those under intermediate and low ones; roots under the low light intensity were shorter than those of other light intensities. These findings indicate that high light intensity affects leaves of cattleya mericlone plantlets more than their roots, while low light intensity has a reverse effect.... (author abst.)

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