干旱区生态环境知识资源中心(Arid): Rapid prediction of the re-watering time point of Orychophragmus violaceus L. based on the online monitoring of electrophysiological indexes

Arid

DOI	10.1016/j.scienta.2019.108642
	Rapid prediction of the re-watering time point of Orychophragmus violaceus L. based on the online monitoring of electrophysiological indexes
	Xing, Deke 1; Chen, Xiaole 1; Wu, Yanyou 2; Xu, Xiaojian 1; Chen, Qian 1; Li, Lin 1; Zhang, Chuan 1
通讯作者	Wu, Yanyou
来源期刊	SCIENTIA HORTICULTURAE
ISSN	0304-4238
EISSN	1879-1018
出版年	2019
卷号	256
英文摘要	Karst arid environments are not conducive to the normal growth of plants. Mastering the irrigation time point in advance can not only guarantee yield but can also save water resources in these regions. The seedlings of Orychophragmus violaceus L. during winter drought periods were processed by simulating a karst osmotic stress environment (high pH, high bicarbonate concentration, and drought) in a growth chamber to study the responses of photosynthesis, carbonic anhydrase (CA), leaf tensity (T-d) and growth traits. All the plants were exposed to osmotic stress induced by poly-ethylene glycol (PEG 6000) at 5 levels (0, 10, 20, 40, and 80 g L-1 PEG) in the presence of 10 mmol L-1 NaHCO3. The physiological osmotic stress tolerance threshold of O. violaceus was investigated. Leaf area and dry weight biomass (DW) estimation models were established, a non-destructive and rapid measurement of the DW was achieved. By analysing the temporal dynamic variations in the DW, combined with the relationship between T-d and DW, a prediction of the re-watering time point of O. violaceus was achieved. The results indicated the following: (1) O. violaceus maintained good water status and high photosynthetic efficiency when the stress level was not higher than 20 g L-1 PEG, and its physiological osmotic stress tolerance threshold was 20 g L-1 PEG; (2) the growth rate of DW was calculated according to the derivative of the four-parameter logistic growth equation at each osmotic stress level. The appropriate percentage for the decline in growth rate under osmotic stress was 30% or 50% to achieve an improvement in product quality. The re-watering time points of O. violaceus that corresponded to the given decline in the growth rate at 10 g L-1 PEG was day 4.90 or day 2.66, and that at 20 g L-1 PEG was day 1.41. Subsequently, the T-d corresponding to the above-mentioned re-watering time point was calculated according to the four-parameter logistic equation and mathematical model between T-d and DW. O. violaceus at 10 g L-1 PEG should be re-watered when the T-d is 0.99 or 0.48, and O. vioiaceus at 20 g L-1 PEG should be re-watered when the T-d is 0.69. O. violaceus at 10 g L-1 PEG exhibited greater long-term osmotic stress resistance than that at 20 g L-1 PEG. Re-watering for O. violaceus at 10 g L-1 PEG could minimize the water demand with corresponding minimal impact on the DW, thereby leading to improved economic returns to water; and (3) as such, the rapid prediction of the re-watering time point can be achieved through online monitoring of electrophysiological parameters such as T-d.
英文关键词	Water deficit Physiological capacitance Osmotic stress Tolerance Growth indexes Four-parameter logistic equation
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000481723200096
WOS关键词	IRRIGATION ; STRESS
WOS类目	Horticulture
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218739
作者单位	1.Jiangsu Univ, Inst Agr Engn, Key Lab Modern Agr Equipment & Technol, Minist Educ, Zhenjiang 212013, Jiangsu, Peoples R China; 2.Chinese Acad Sci, Res Ctr Environm Biosci & Technol, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Guizhou, Peoples R China
推荐引用方式 GB/T 7714	Xing, Deke,Chen, Xiaole,Wu, Yanyou,et al. Rapid prediction of the re-watering time point of Orychophragmus violaceus L. based on the online monitoring of electrophysiological indexes[J],2019,256.
APA	Xing, Deke.,Chen, Xiaole.,Wu, Yanyou.,Xu, Xiaojian.,Chen, Qian.,...&Zhang, Chuan.(2019).Rapid prediction of the re-watering time point of Orychophragmus violaceus L. based on the online monitoring of electrophysiological indexes.SCIENTIA HORTICULTURAE,256.
MLA	Xing, Deke,et al."Rapid prediction of the re-watering time point of Orychophragmus violaceus L. based on the online monitoring of electrophysiological indexes".SCIENTIA HORTICULTURAE 256(2019).