Abstract
This study investigated the effect of drought stress on the yield, water use efficiency (WUE), physiology, and seed quality of two species Lallemantia sp. Field experiments with three irrigation regimes were carried out in a split plot factorial in a randomized complete block design with three replications. Treatments included irrigation after 40 %, 60 %, and 100 % depletion of available soil water (ASW) (I40, I60, and I100, respectively) as main plots and Lallemantia species L. iberica (M. Bieb.) Fisch. & C. A. Mey. (S1) and L. royleana Benth. in Wall (S2) as subplots. Increment in depletion of ASW (I40 to I100) resulted in progressively less chlorophyll a content (Chl a), open stomata percentage (OS), and leaf area index (LAI). The highest Chl a and LAI were found to be 0.0087 mg g−1, and 2.68 mg g−1 leaf mass in I40 treatment, respectively, while closed stomata percentage (CS) increased significantly as drought stress increased. The results of this experiment indicated that the appropriate yield of production was obtained in plots which were fully irrigated (I40) for all species of Lallemantia; however, the WUE increased as drought stress increased. The interaction of drought stress, Lallemantia species with grain yield and WUE was significant.
Highlights
Lallemantia, commonly known as Balangu, belongs to the family of Labiatae and is represented by five species: L. iberica
There was no significant difference in the Leaf area index (LAI) of L. royleana in any irrigation system, in L. iberica the LAI was significantly reduced as drought stress increased
The present study was designed to determine the effect of soil moisture content on ecophophysiological responses of Lallemantia species
Summary
Lallemantia, commonly known as Balangu, belongs to the family of Labiatae and is represented by five species: L. iberica Lallemantia is an annual or perennial herb, a dwarf shrub (Anonymans, 2003), and is characterized by simple, ovate to round or sometimes linear, aristae-toothed bracteole, oblong, trigonous, smooth, and mucilaginous nettled leaves (Harley et al ,2004). It is a good source of fiber, oil, and protein and has medicinal properties (Naghibi et al, 2005). Based on the proportion of young people in developing countries, the requirement for water will continue to increase significantly during the few decades. Diffusive resistance of the stomata to CO2 entry is probably the main factor limiting photosynthesis in
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