Chlorophyll fluorescence upper-to-lower-leaf ratio for determination of irrigation time for Pentas lanceolata

Title:

Chlorophyll fluorescence upper-to-lower-leaf ratio for determination of irrigation time for Pentas lanceolata

Creator:

Wu, C. W., Lee, M. C., Peng, Y. L., Chou, T. Y., Lin, K. H., and Chang, Y. S.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:99ec9593-226e-47c2-b881-58b6092d1c9f
uuid:99ec9593-226e-47c2-b881-58b6092d1c9f
issn:0300-3604
doi:10.1007/s11099-015-0175-5

Subject:

fotosyntéza, photosynthesis, nondestructive technique, reflectance spectroscopy, rewatering, water status, water stress, 2, and 581

Type:

model:article and TEXT

Format:

print, bez média, and svazek

Description:

The objective of this study was to use nondestructive measurements as the precise irrigation indices for potted star cluster (Pentas lanceolata). Drought stress was imposed on plants for 0, 3, 5, 7, 12, and 16 d by withholding water. Measurements were conducted on the third leaf counted from the apex (upper leaves) and on the third leaf from the bottom (lower leaves). Within the range of soil water content (SWC) from 10 to 45%, leaf water potential (WP), SWC, and soil matric potential (SMP), chlorophyll fluorescence, photochemical reflectance index (PRI), adjusted normalized difference vegetation index (aNDVI), and the reflectance (R) at 1950 nm (R1950) were measured. The plants reached the temporary wilting point at -3.87 MPa of leaf WP; the maximal fluorescence yield of the light-adapted state (Fm′) ratio of upper-to-lower leaves was 1.7. When the Fm′ ratio was 1.3, it corresponded to lower-leaf WP < -2.27 MPa, SWC < 21%, SMP < -20 kPa, PRI < 0.0443, aNDVI < 0.0301, and R1950 > 8.904; it was the time to irrigate. In conclusion, the Fm′ ratio of upper-to-lower leaves was shown to be a nondestructive predictor of leaf WP and can be used to estimate irrigation timing., C. W. Wu, M. C. Lee, Y. L. Peng, T. Y. Chou, K. H. Lin, Y. S. Chang., and Obsahuje seznam literatury

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

193-200

Source:

Photosynthetica | 2016 Volume:54 | Number:2

Harvested from:

CDK

Metadata only:

false