Effect of halo priming on germination and growth parameters of finger millet, little millet, and barnyard millet under osmotic stress

Abstract

Seed priming has gained attention as a sustainable approach to improve crop performance. Halopriming, in particular, has shown promise in enhancing germination, growth, and stress tolerance. This study aimed to assess the effect of halopriming on the growth of finger millet (Eleusine coracana) variety CO(Ra) 15, little millet (Panicum sumatrense) variety ATL 1, and barnyard millet (Echinochloa frumentacea) variety CO(KV) 2 in osmotic conditions. The experiment used different salt solutions with 0, 1, and 1.8 g/L NaCl concentrations. In Hp1 (halo priming 1) finger millet variety CO(Ra) 15, 100% seed germination was observed in normal conditions. In Hp2, the little millet variety ATL 1 has shown 100% seed germination under osmotic stress with a concentration of 1 g/L NaCl (S1). In Hp1, barnyard millet variety CO(KV)2 showed 100% seed germination under osmotic stress with a concentration of 1.8 g/L NaCl (S2). Various growth parameters were recorded, and results showed that the barnyard millet variety Co (KV)2 and the little millet variety ATL 1, both under the Hp1 category, demonstrated the longest shoot lengths of 7.3 cm and 5.85 cm respectively under salt stress (S1). Furthermore, In Hp 1 finger millet variety CO(Ra) 15 recorded the highest root length of 12.25 under salt stress (S2). Vigour Index showed that Hp1 showed positive results regarding the germination percentage and seedling growth of finger millet variety CO(Ra) 15 and little millet variety ATL 1. This study suggested halopriming is an effective technique for promoting sustainable agriculture, especially in areas affected by salinity stress.