Primocane morphology and leaf surface characteristics of greenhouse-grown red raspberry cultivars
1998
Upadhyaya, M.K. | Furnes, N.H.
Abaxial and adaxial surfaces of the distal leaflet of the third leaf from the apex, and primocane morphology of the following internode, of six greenhouse-grown red raspberry (Rubus idaeus L.) cultivars ('Algonquin', 'Chilliwack', 'Comox', 'Haida', 'Meeker', and 'Tulameen') were examined. Scanning electron micrographs revealed tangled, woolly pubescence, irregularly shaped cells, and stomates on abaxial leaf surfaces. 'Algonquin' exhibited the densest pubescence, and 'Haida' the sparsest. Smooth-walled, uniserate trichomes were present on adaxial surfaces. 'Chilliwack' displayed greatest trichome abundance. Trichomes were less commonly seen on the adaxial leaf surface of 'Algonquin', 'Haida', and 'Meeker'. Relative abundance of spines on 3-month-old primocanes was dense for 'Tulameen', moderate-dense for 'Meeker' and 'Comox', moderate for 'Chilliwack', sparse-moderate for 'Algonquin', and sparse for 'Haida'. Spine length was greatest for 'Tulameen', and was greater in 'Meeker' than in 'Haida'.
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