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Seedling characteristics of Erythrina suberosa Roxb. are described. Its seeds were collected from a tree growing in the Campus of University of Karachi and germinated without any dormancy breaking treatment in pots filled with garden sandy loam soil maintained at 75% MWHC. Maximum germination was 50% achieved within a week. The seedlings were studied when they were 20-day (younger) and 50-day old (elder). The seedling was of Phanerocotylar – Epigeal Reserve type. The major allocation of biomass in 20-day seedlings was in leaves and in 50-day seedlings in leaves and hypocotylar stem. The major growth spur in seedlings during the 30-day period from 20th to 50th day was in hypocotylar and epicotylar stem and root. Tap root had profuse laterals. Numerous root nodules 3.5 - 5mm in diameter were present generally on the main root. Cotyledons were large, green fleshy –food laden, concave inside and convex outside with no visible venation. They were wholly consumed within 50 days after germination. Internode size reduced from base to apex regularly. The hypocotyl was green, shining and provided with little prickles. Epicotyl is hairy. The primary leaves were simple opposite, erect, glaucous dorsally and pubescent ventrally. The subsequent leaves were pinnately trifoliate (ternate) with three leaflets. Each leaf had small, green and linear-lanceolate stipules. Glanduliform stiples present. Epicotyl was longer than hypocotyl. The total leaf area of elder seedlings was (209.08 ± 15.71 cm2 ) -1.6 times to that in the younger seedlings. The leaf venation was pinnate camptodromous (festooned brachidodromous) type. Vein-endings were straight or curved and unbranched. Two types of trichomes were seen – branched trichomes and capitate glandular trichomes. The leaves were hypo-amphistomatic – paucistomatic dorsally and multistomatic ventrally. The cotyledonary stomata were of paracytic type but on ventral surface of leaf five types of stomata (sensu Prabhakar, 2004) - paracytic, anisocytic, anisotricytic, anomocytic and staurocytic were present; paracytic being the most abundant and staurocytic the least. Stomata on dorsal side of leaf were rare and of paracytic type only along the main vein. Both surfaces of leaf had capitate glandular trichomes (6.16 per mm2 on ventral surface and much infrequent on the dorsal side). The number of stomata on ventral surface of the leaf tended to be normally-distributed amongst the 100 sampling fields of the microscope vision (each of 0.10174 mm2 ) at 45 x 10 X magnification. The mean density of stomata per mm2 was 110.28 ± 2.07 (68.80 – 157.3; CV: 18.73%).
D. Khan, Zulfiqar Ali Sahito, M. Javed Zaki. (2014) SEEDLING CHARACTERISTICS OF ERYTHRINA SUBEROSA ROXB., , Volume 11, Issue 4.
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