Effects of the interaction between shade and drought on physiological characteristics in Calamus viminalis seedlings

Abstract

Recently, the endangerment of wild rattan population draws attention on the conservation and sustainable utilization of rattan resources. Rattan growing usually faces the light and water stress. Therefore, we aim to explore the combined effects of shade and drought on seedling growth, thus providing a theoretical ground for the conservation and artificial cultivation of the rattan. The combined effects of shade and drought on physiological and biochemical traits were studied in two-years-old Calamus viminalis seedlings. Photosynthetic indices including Pn, Gs, Tr, and Ci and physiological indices including MDA, SOD, POD, CAT, and Pro were measured under four levels of water treatments and four levels of shade. Shade, drought and their interaction have a significant effect on C. viminalis seedlings growth. Generally, moderate shade could alleviate the impact induced by drought. However, mild drought usually enhances the effect caused by shading. The result showed that the shade decreased Pn, Gs, and Tr but increased Ci, MDA content and Pro content. Either with the shading or drought increasing, the activity of SOD, POD, and CAT firstly increase and then declined. Drought reduced Pn, Gs, Tr, and Ci but increased the content of MDA and Pro. Overall, the result suggests that 25-50% shading and 65% RSWC water treatment are most beneficial for the growth of C. viminalis seedlings.

Effects of different shading levels on the growth of Bornmuellera emarginata, a nickel hyperaccumulator for use in agromining

“…This result is significant, meaning that shading stress does not affect plants as proline is an important osmolyte that plays a vital role in regulating plant cell osmotic pressure and alleviating damage caused by stress conditions (Haffani et al, 2014; Mahajan & Tuteja, 2005). This result is also consistent with the results of Chen et al (2020) who investigated the effects of the interaction between shade and drought on physiological traits of Calamus viminalis seedlings (a climbing plant of the Palmae family). Regarding proline content, their results showed that it was lower under full light than in mild and moderate shading but increased significantly with deep shading.…”

“…Regarding proline content, their results showed that it was lower under full light than in mild and moderate shading but increased significantly with deep shading. This suggests the damage caused by full light and deep shading triggers a large accumulation of proline in the plant (Arora & Saradhi, 2002; Chen et al, 2020).…”

Light Deficiency Inhibits Growth by Affecting Photosynthesis Efficiency as well as JA and Ethylene Signaling in Endangered Plant Magnolia sinostellata

“…Various studies found that low light intensity can impact disease resistance in plants, and many works proved that plants reduced stress tolerance under light deficiency [50][51][52][53][54][55][56]. Moreover, our previous study also found that light deficiency impacted stress tolerance in M. sinostellata [64].…”

“…Given that low light intensity can impact stress tolerance in various plants, such as Calamus viminalis, Anoectochilus roxburghii, and Leymus chinensis [50][51][52], and light deficiency also weakened the resistance of M. sinostellata [53], stress response TFs were identified and analyzed in a genome wide range. TIFY and mitochondrial transcription termination factors (mTERFs) are related to stress response and have important roles in stress tolerance in plants [72,73].…”

“…JA interacts with ethylene signaling pathways to regulate abiotic stress tolerance and may act as a core signal in such an intertwined network [49]. Various studies found that light deficiency can alter stress tolerance and disease resistance in plants [50][51][52][53][54][55][56]. However, its molecular mechanisms in plants are complex and unclear.…”