Abstract
This study aimed to evaluate the dominant factors of physiological responses of Phyllostachys edulis (Carrière) J. Houz to drought stress. The calcium (Ca2+) fluxes in root tips of P. edulis treated by polyethylene glycol were monitored via non-invasive micro-test technology. The physiological indexes of P. edulis under different soil moisture contents were determined. The regression model was built by curve fitting with the main physiological factors of P. edulis using PCA analysis. The variance contribution rates of the first three principal components of the physiological indicators were 75.0%, 13.3% and 5.0%. Calcium signal sensing protein kinase (CDPK) contents accounted for a larger contribution to the load of the first principal component. The contents of calcium signal sensor protein calmodulin (CaM) and calcium-dependent protein kinase (CDPK) increased. Meanwhile, drought induced strong Ca2+ influxes in root tips. Additionally, as the soil water content decreased, the contents of malondialdehyde (MDA), proline, betaine, jasmonic acid (JA) and abscisic acid (ABA) increased, and auxin (IAA) decreased in P. edulis leaves, strongly correlating with the CaM and CDPK contents. The calcium signal of P. edulis is activated and cascades plant physiological responses to drought stress. This study will provide physiological evidence for research regarding mechanisms of drought resistance of P. edulis.
Highlights
The analysis revealed that the factors contributing more to their loadings in the first principal component were Pro, CaM, calcium-dependent protein kinase (CDPK), tributing more to their loadings in the first principal component were Pro, CaM, CDPKs, MDA, IAA, IAA, jasmonic acid (JA), JA,and andABA, abscisic acid (ABA),and andininthe themeantime, meantime,superoxide dismutase (SOD)
It was hypothesized that the regulation of osmotic stress on drought resistance and the co-regulation of hormones were both caused by calcium signal transduction
According to the regression model of calcium sensing protein (CaM, CDPKs) conand relative soil water content (RWC) (Table 3), the analysis showed that with the decrease tents and relative soil water content (RWC) (Table 3), the analysis showed that with the in relative soil water content (RWC), the content of CaM and CDPKs in P. edulis leaves decrease in relative soil water content (RWC), the content of CaM and CDPKs in P. edulis showed a “U” pattern of falling rising
Summary
As a fast-growing bamboo species with ecological and economic benefits, Phyllostachys edulis (Carrière) J. Houz plays an important role in replacing wood with bamboo and ecological construction. Drought caused by seasonal factors in bamboo areas of China was considered to be one of the difficult problems affecting the cultivation of bamboo forests and the preservation of germplasm resources. Water is an important ecological factor that restricts the geographical distribution and growth of bamboo. To explore the physiological response mechanism of bamboo under drought stress was an important breakthrough for the study of drought resistance adaptability and water-saving and the efficient cultivation of bamboo, and a strong guarantee for improving the conservation strategy of bamboo germplasm resources
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
