تحسين نسبة إنبات بذور أربعة أنواع من أجرد الكمأة Helianthemum باستخدام بعض معاملات البذور

Abstract EN

The enhancement of seeds germination for four Helianthemum species (H.salicifolium, H.ledifolium, H.almeriense and H.violaceum) was studied in the National Commission for Biothecnology laboratories in 20132014/ season (Syria).

The six seed treatments were: 1) mechanical scarification; 2) chemical scarification by using concentrated sulfuric acid; 3) soaking in distilled sterilized water for 24h; 4) mechanical scarification + soaking in distilled sterilized water for 24h; 5) chemical scarification by using concentrated sulfuric acid + soaking in distilled sterilized water for 24h; 6) untreated control.

The germination values recorded were: total germination percentage, germination period in days to reach the total germination percentage and the germination rate.

Results showed that the treatment of mechanical scarification + soaking in water was significantly superior with the highest germination percentage (95.54%), shortest germination period (5.88 day) and the highest germination rate (17.45%/day).

While the soaking in water treatment was the worst treatment with the lowest germination percentage (24.55%), longest germination period (19.62 day) and the lowest germination rate (1.19 %/day).

The increase of germination ratio after seeds scarification for all Helianthemum studied species indicates that the reason of seed dormancy is due to its impermeable coat, which prevents seeds physically from absorbing water required for germination, causing poor germination of untreated seeds.