Hydroponic screening for iron deficiency tolerance in evergreen azaleas.
NOTULAE BOTANICAE HORTI AGROBOTANICI CLUJ-NAPOCA(2015)
摘要
Evergreen azaleas grow in acid soil and suffer from iron deficiency when cultivated in substrate with pH higher than 6.0. In order to select tolerant plants, 11 azalea genotypes were tested for 21 days in alkaline solution (pH 9), buffered with sodium hydrogen carbonate (1 g.l(-1)). Leaf damage, root length and mortality rare were recorded. While leaf damage and mortality rate allowed to discriminate genotypes, root development appeared not directly linked to iron deficiency tolerance. Rhododendron 'Juko', R. scabs-urn, R. macrosepalum 'Hanaguruma', R. x pulchrum 'Oomurasaki', and R. x pulchrum 'Sen-e-oomurasaki' resulted iron efficient genetic resources, useful for azalea cultivation and gardening in calcareous soils. On the contrary, R. obtusum 'Kitin', R. tosaense, R. x mucronatum 'Fujimanyo and R. obtusum 'Susogo-no-ito' resulted iron deficiency sensitive genotypes. R. x mucronatum 'Ryukyushibori' and R. indicum 'Kinsai' showed intermediate responses.
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关键词
alkalinity,breeding iron chlorosis,Rhododendron,sodium hydrogen carbonate
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