Physiological Effects of Chitosan Coating on Wheat Growth and Activities of Protective Enzyme with Drought Tolerance

Abstract

Seedling period is an important stage of plant growth. This research was mainly to analysis the influence of chitosan on wheat seedling growth and physiological mechanisms under drought stress. The results showed that the group coated with chitosan significantly improved the growth index such as germination rate, wet weight, root length, root active, and impacted physiological indices such as superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT)), the content of malwondialdehyde (MDA) and chlorophyll compared with CK under drought stress. Activities of POD, CAT and SOD increased and then decreased, the content of MDA increased under drought stress. But. variation rates of the group coated with chitosan were slower than that of CK, which indicates that chitosan can significantly improve anti-oxidant enzymes activity to clear timely active oxygen and reduce the content of MDA so as to alleviate the degree of damage in the drought stress and make seedlings grow better. The results also showed that chitosan improved chloro-phyll content than that of CK, which demonstrated that chlorophyll content significantly influenced the photosynthetic efficiency of the mutant and added wheat above ground biomass and the field experiment results showed that chitosan increased yield 13.6% than that of CK

Biostimulant activity of chitosan in horticulture

“…However, H 2 O 2 scavenging substances inhibit PRP expression (Lin et al, 2005). Moreover, H 2 O 2 can also play a role as messenger for abiotic stress responses, leading to an increase of abiotic stress tolerance in some plant species through chitosan priming (Pongprayoon et al, 2013;Zeng and Luo, 2012). The production of NO is a prerequisite for the production of PA (Raho et al, 2011), which interacts with the ABA negative regulator, ABI1, leading to ABA response activation (Zhang et al, 2004).…”

A consortium of rhizobacterial strains and biochemical growth elicitors improve cold and drought stress tolerance in rice (Oryza sativa L.)

“…; Zimmerli et al . ; Zeng & Luo ). Although several abiotic elicitors have been tested for tolerance to drought and cold stress in rice (Garg et al .…”

Cowpea resistance induced against Fusarium oxysporum f. sp. tracheiphilum by crustaceous chitosan and by biomass and chitosan obtained from Cunninghamella elegans

“…This polymer demonstrates ability to induce marked morphological changes, structural alterations and molecular disorganization of the fungal cells. On the other hand, this biopolymer displays indirect activity when induce defense mechanisms in plants, stimulates the production of reactive oxygen species, inhibits the action of proteinases, alters the metabolism of phytoalexins, promotes lignification, induces the formation of phenolic compounds, stimulates the accumulation of pathogenesis related (PR) proteins such as chitinase, b-1,3-glucanase (Ali et al, 2014;Li et al, 2015), and activates peroxidase (Ortega-Ortiz et al, 2007), superoxide dismutase and catalase enzymes (Zeng and Luo, 2012). The PR proteins assist in the reduction of plant diseases, such as b-1,3-glucanase act as a mechanical barrier for blocking the invasion of fungi into the plant tissue and also protects the tissue against phytotoxic substances produced by the fungus.…”