Melki M, Dahmani Th
Ecole Supérieure d'Agriculture du Kef, 7119, Tunisie.
Pak J Biol Sci. 2009 Dec 1;12(23):1531-4. doi: 10.3923/pjbs.2009.1531.1534.
The effects on morphological and physiological characters of durum wheat (Triticum durum Desf.) plants issued from seeds upon irradiation with low doses of cobalt gamma rays (i.e., 0, 10, 20 and 30 Gy), were studied. The study is carried out in the Experimental Research Station of Ecole Supérieure d'Agriculture du Kef (North West Tunisia) in 2008/2009. In Petri dishes, the 20 Gy dose caused an increase of the speed and Germination Capacity (GC) of the seeds as compared to non irradiated ones. Plants from these treated seeds maintained on Knops' culture medium (culture medium used to study plant growth in test tubes), improved root system in terms of length, volume and weight when compared to the plants issued from the non treated seeds. This irradiation dose (20 Gy) also improved in a significant way the above ground system growth of the plants. Under glass house conditions with a water stress, the plants issued from seeds treated with 20 Gy, had higher water content and membrane stability as compared of those from the non irradiated ones. Furthermore, seed irradiation with this dose had a positive effect on the chlorophyll content and maximum quantum yield of the irradiated plants. These results suggest that ionizing irradiation may be considered as an alternative in improving root growth of the plant and therefore controlling drought.
研究了低剂量钴伽马射线（即0、10、20和30戈瑞）辐照种子后对硬粒小麦（Triticum durum Desf.）植株形态和生理特征的影响。该研究于2008/2009年在突尼斯西北部凯夫高等农业学院实验研究站进行。在培养皿中，与未辐照的种子相比，20戈瑞剂量使种子的发芽速度和发芽能力（GC）有所提高。在Knops培养基（用于研究试管中植物生长的培养基）上培养的这些处理种子长成的植株，与未处理种子长成的植株相比，根系在长度、体积和重量方面均有所改善。这个辐照剂量（20戈瑞）还显著促进了植株地上部分的生长。在温室水分胁迫条件下，与未辐照种子长成的植株相比，经20戈瑞处理种子长成的植株含水量更高，膜稳定性更好。此外，用该剂量辐照种子对辐照植株的叶绿素含量和最大量子产量有积极影响。这些结果表明，电离辐照可被视为促进植物根系生长从而控制干旱的一种替代方法。
