Effects of water-deficit stress and paclobutrazol on growth, relative water content, electrolyte leakage, proline content and some antioxidant changes in Curcuma alismatifolia Gagnep. cv. Chiang Mai Pink

Abstract

Effects of water-deficit stress and paclobutrazol (PBZ) on the physiological and biochemical changes in Curcuma alismatifolia Gagnep. cv. Chiang Mai Pink (Zingiberaceae) were investigated. One hundred rhizomes were grown for 30–35 days and then divided into the following 4 treatments: (1) well-watered, (2) not watered, (3) well-watered and treated with 1500 ppm PBZ being applied once to the soil, and (4) not watered but treated with 1500 ppm PBZ. After 50 days of growth, watering was withheld for 30 days. After water stress was initiated, plant height, plant fresh weight, soil water content, relative water content (RWC), electrolyte leakage (EL), proline content, vitamin C and E content, as well as the activities of catalase (CAT) and superoxide dismutase (SOD) in the leaves were determined every 10 days. The results showed that water-deficit stress decreased plant height and plant fresh weight, whereas this stress and PBZ did not result in a decrease in these parameters. Water stress reduced RWC, but induced EL and proline content in the leaves. However, the leaves showed opposite results when PBZ was added to the treatments. Some antioxidants such as vitamin C, vitamin E, and the activities of CAT and SOD were induced in the leaves by PBZ. Moreover, the content of vitamin C, vitamin E and CAT activity were higher in relation to water-deficit stress and PBZ treatments. This indicates that PBZ induced a number of some physiological and biochemical adaptations (maintaining growth and RWC, decreasing EL and proline content, increasing the vitamin C and vitamin E levels, and CAT and SOD activities) that enable the Curcuma plant to tolerate drought.

Paclobutrazol improves salt tolerance in quinoa: Beyond the stomatal and biochemical interventions

“…The PBZ application lowered the MDA contents in leaves and roots of quinoa under salt stress observed in the present study, which also corresponds with the finding that triazole compounds improve salinity tolerance due to lower ROS accumulation or increased pool of osmolytes (Figure c) to reduce lipid peroxidation by the oxidative stress. Such improvement in salinity tolerance by exogenously applied PBZ in quinoa plants had also been reported in rice (Pan et al., ), tomato (Tuna, ) and tulips (Jungklang, Saengnil, & Uthaibutra, ) under different abiotic stresses. This was also confirmed by a strong positive correlation between roots and leaves for osmoprotectants, lipid peroxidation and antioxidant enzymes (Figure ).…”

Effect of Paclobutrazol Application Time on Growth, Yield and Starch Content of Two Cassava Cultivars under Rainfed Conditions of Northeastern, Thailand

“…In the present experiment, cassava experienced drought at five months after planting for three months prior to harvest. Jugklang and Saengnil (2012) reported that PBZ application to the crops increased drought tolerance by inducing a number of physiological and biochemical adaptation such as maintaining relative water content in leaves, decreasing electrolyte leakage and proline content, increasing the vitamin C and vitamin E levels and the activities of catalase and superoxide dismutase (Jungklang et al 2017). Based on these results, PBZ might delay leaves senescence during drought period and finally allow that plant to maintain its leaf number per plant and leaf area index in the present experiment.…”

Abiotic Stress And Biofertilizer on The Pereskia bleo (Kunth) DC. Against Growth, Proline, and Antioxidants

“…Proline accumulation is an indicator of the plant's response to abiotic stresses, especially drought and salinity. Some studies report that proline accumulation is lower in tolerant plants than in plants that are sensitive to salinity stress and drought (Jungklang et al, 2017). Proline is a compound that includes amino acids that can be used to show the plant's response to stress in drought and salinity (Li et al, 2018).…”