EFFICIENCY OF Trichoderma spp. ISOLATES IN ENHANCING SEEDS GERMINATION AND SEEDING GROWTH OF SOUR ORANGE

Abood, M.R.; M. Abood, H.; H. Saeed, F.

	EFFICIENCY OF Trichoderma spp. ISOLATES IN ENHANCING SEEDS GERMINATION AND SEEDING GROWTH OF SOUR ORANGE
The Iraqi Journal of Agricultural Science
Article 1, Volume 39, Issue 2, 2008, Pages 19-25
Authors
M.R. Abood; H. M. Abood; F. H. Saeed
Abstract
This study was conducted to evaluate the efficiency of 30 isolates of the fungus Trichoderma spp. in enhancing seed germination and seedling growth of sour orange Citrus aurantium. The results revealed the varied influence of the tested isolates of Trichoderma spp. in sour orange seed germination as manifested by reducing the period required for seeds germination and increasing the percentage of germinated seeds. The influence was ranged from the positive for the most tested isolate to the harmful for few of them, while other tested isolate didn't show any influence. Isolates T2, T3, T5, T7, T7, T8, T9, T12, T14, T19, T20, T21 ,T22 ,T23, T24, T26 , T27 AND T28 showed significant reduction in the period required for seeds germination which recorded 30, 24, 30, 28, 30.6, 28, 22, 30.3, 28.3 ,28 ,29.6 ,25.6 ,27.6 ,30, 30, 22.3 , 30 and 23 days respectively and significant increment in the percentage of germinated seeds which recorded 57.7, 75.5, 64.4, 51.1, 53.3, 75.5, 82.2 , 55.5, 53.3, 66.6 ,59.9 , 71.0 ,62.1 ,56.6 66.6 , 82.2 , 55.5 and 80.0 % respectively. Three isolates namely T9 , T26 and T28 were the superior in both parameters which recorded 22.0 ,22.3 and 23.0 days and 88 , 82, 80% compared to 33 days and 84.8% in control treatment.lsolates T9, T26 and T28 showed significant increment in the following seedling growth parameters: root length, stem highth fresh and dry weight for shoot, fresh and dry weight of roots and total chlorophyll concentration in leaves which recorded (22.0, 20c 19.0) cirn (43.0, 42.0, 40.0cm)c (7.0, 6.8, 6.0gm), (2.9, 3.0, 2.8gm) (3.6, 3.5, 3.0gm), (2.1, 2.0, 1.8gm), and (17.4, 17.3,17.7mg/gm) compared to (12.0cm c 30.0cm, 3.0 gm, 1.7 gm, 1.5 g, 0.9 gm and 10.91 mg/gm ) in control treatment respectively.

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