Document Type : Original Article
Authors
1 Master's student, Department of Horticulture and Landscape Architecture, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran.
2 Assistant Professor, Department of Horticulture and Landscape Architecture, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran.
3 Postdoctoral Researcher, Razavi Seeds and Seedlings Institute, Mashhad, Iran.
Abstract
To investigate the effect of seed coating on characteristics related to germination of lettuce seeds under drought stress conditions, a factorial experiment was conducted a completely randomized design with 4 replications during 2022. The experimental treatments include seed coating(C1:uncoated seeds (control), C2:seed coating with kaolin+gibberellin,C3:seed coating with kaolin+humic acid+gibberellin, C4:seed coating with gibberellin+micro elements+kaolin, C5:seed coating with gibberellin+ macro elements + kaolin, C6:seed coating with humic acid+micro+macro elements+ kaolin, C7:seed coating with gibberellin + humic acid+ micro + macro elements + kaolin and it was evaluated under three levels of drought stress(no stress(control),-0.4 MPa,- 0.8 MPa). In the stress condition of -0.8 MPa, only two treatments C2 (16%) and C3 (8%) had germination. In the stress of 0.4 MPa, treatments C1, C2, C3, respectively, in the characteristics of germination percentage (88.50, 61.75 and 27.50), germination speed (6.46, 3.91 and 2.25) and root index The seeds (130/28, 93/32 and 44/02) had significant differences with each other and also with non-stressed conditions (control); So that C1 seed (control) had 72.5% and C3 seed had 11.5% reduction in germination compared to non-stressed conditions. C3 coating improved the average germination time compared to C1 coating (3.07). The results of the experiment showed that drought stress is a limiting factor in the germination of lettuce seeds by limiting water absorption, and some treatments such as gibberellin+ kaolin coating and gibberellin+ kaolin+ humic acid improve the characteristics related to lettuce seed germination.
Keywords
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