Abstract
Due to low rainfall at early autumn, smooth vetch seedling growth in rain-fed lands often is limited by water deficit stress yet the data regarding the reactions of smooth vetch to water deficit at early growth stages are pretty rare. The objective of current study was to examine possibility of using priming treatments (hydro priming and priming salicylic acid) to alleviate the inhibitory effect of water deficiency during early growth of Smooth Vetch. In this respect, seeds were soaked in distilled water (hydro priming) or 0.5 mM solution of SA for 36 h at 10 °C then dried back to original moisture content. Pots were irrigated for 25 days at four levels of available water containing field capacity (FC), 75% FC, 50% FC and 25% FC. In general, seedling emergence and early growth were markedly limited by increasing water deficiency. However, priming treatments particularly with SA caused considerable improvement in either emergence or growth of seedlings (dry weight, length). The obtained results showed that primed samples exhibited higher accumulation of proline, glycine betaine (GB) under all levels of available water except 100% FC and also higher total soluble sugars (TSS) and trehalose under severe water deficit (25% FC). SA primed samples had higher relative water content especially under higher levels of water deficiency. The more balanced water status within SA primed samples also was accompanied with higher accumulation of proline and glycine betaine. There were significant differences between two priming treatments in terms of proline and GB content within seedlings and SA priming considerably increased proline and GB accumulation. In contrast to proline and GB, TSS and trehalose content wasn’t influenced by SA treatment and both hydro and SA primed samples showed statistically similar quantities.
Highlights
Vetch species including smooth vetch (Vicia dasycarpa) are cultivated in West and North West of Iran either as forage crop or as green manure
In current study we examined the possibility of using priming treatments with water and salicylic acid to mitigate the harmful effects of water deficiency during early growth of Smooth Vetch seedlings
While root length increased under lower available water, shoot length consistently decreased by more severe water deficit levels
Summary
Vetch species including smooth vetch (Vicia dasycarpa) are cultivated in West and North West of Iran either as forage crop or as green manure. Lack or shortage of rainfall during the early growth of vetch, which is rampant throughout the region, causes water stress and limits the seedling emergence, growth and restrict the plant potential to produce sufficient forage or green manure yield. Currently it is proposed that osmolytes play critical role regarding osmotic adjustment and have other physiological roles such as scavenging reactive oxygen species which is vital under osmotic stress (Chen & Murata, 2002). In this respect, Fernandez et al (2010) expressed that osmolytes along with osmotic homeostasis, are involved in maintaining of jas.ccsenet.org
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