TY - JOUR
T1 - Water-use efficiency and physiological responses of maize under partial root-zone irrigation
AU - Li, Fusheng
AU - Wei, Caihui
AU - Zhang, Fucang
AU - ZHANG, Jianhua
AU - Nong, Mengling
AU - Kang, Shaozhong
N1 - Funding Information:
We are grateful to the research grants from the National Natural Science Foundation of China ( 50869001 ), the National High Technology Research and Development Program of China (863 Program, 2006AA100203 ) and Hong Kong Research Grants Council ( HKBU 262307 ) and Hong Kong University Grants Committee ( AOE/B-07/9 9).
PY - 2010/8
Y1 - 2010/8
N2 - Alternate partial root-zone irrigation (APRI) is a water-saving irrigation method but also can regulate crop physiological responses. This study investigated how water-use efficiency (WUE) and other physiological responses were regulated at different growth stages when maize plants were applied with APRI and how these responses were recovered to control levels when full irrigation was resumed. A pot experiment was carried out at two fertilization levels and with three irrigation methods at the jointing stage (29-38 days after sowing) or during the jointing and tasselling stages (29-77 days after sowing). The irrigation methods included the conventional irrigation (CI), APRI and fixed PRI (FPRI, watering was fixed to one side). Compared to the CI, APRI at the jointing stage for 10 days or during the jointing and tasselling stages for 49 days reduced water consumption by 10.6-12.9 and 31.7-32.4%, respectively, but did not reduce total dry mass accumulation significantly, thus increased canopy WUE by 10.4-13.6 and 41.2-41.8%, respectively. FPRI reduced the total dry mass significantly even though it also improved canopy WUE. APRI had slight effect on the leaf relative water content (RWC), chlorophyll (Chl), carotenoid (CAR), proline (Pro) and malondialdehyde (MDA) contents and superoxide dismutase (SOD) and peroxidase (POD) activities from jointing to tasselling stages but recovery to the levels of CI was rapid after receiving full watering. In comparison, FPRI treatment significantly reduced leaf RWC, Chl and CAR contents and SOD and POD activities and increased the Pro and MAD contents. After receiving full watering, the above-mentioned physiological indexes in FPRI could not recover fully to the levels of CI. High fertilization treatment only increased leaf Chl content significantly and contributed little to the total dry mass accumulation. Our result suggests that APRI can make plants use water and nutrients more efficiently with better drought tolerance.
AB - Alternate partial root-zone irrigation (APRI) is a water-saving irrigation method but also can regulate crop physiological responses. This study investigated how water-use efficiency (WUE) and other physiological responses were regulated at different growth stages when maize plants were applied with APRI and how these responses were recovered to control levels when full irrigation was resumed. A pot experiment was carried out at two fertilization levels and with three irrigation methods at the jointing stage (29-38 days after sowing) or during the jointing and tasselling stages (29-77 days after sowing). The irrigation methods included the conventional irrigation (CI), APRI and fixed PRI (FPRI, watering was fixed to one side). Compared to the CI, APRI at the jointing stage for 10 days or during the jointing and tasselling stages for 49 days reduced water consumption by 10.6-12.9 and 31.7-32.4%, respectively, but did not reduce total dry mass accumulation significantly, thus increased canopy WUE by 10.4-13.6 and 41.2-41.8%, respectively. FPRI reduced the total dry mass significantly even though it also improved canopy WUE. APRI had slight effect on the leaf relative water content (RWC), chlorophyll (Chl), carotenoid (CAR), proline (Pro) and malondialdehyde (MDA) contents and superoxide dismutase (SOD) and peroxidase (POD) activities from jointing to tasselling stages but recovery to the levels of CI was rapid after receiving full watering. In comparison, FPRI treatment significantly reduced leaf RWC, Chl and CAR contents and SOD and POD activities and increased the Pro and MAD contents. After receiving full watering, the above-mentioned physiological indexes in FPRI could not recover fully to the levels of CI. High fertilization treatment only increased leaf Chl content significantly and contributed little to the total dry mass accumulation. Our result suggests that APRI can make plants use water and nutrients more efficiently with better drought tolerance.
KW - Biomass accumulation
KW - Growth stage
KW - Maize (Zea mays)
KW - Soil fertilization
KW - Water-use efficiency
UR - http://www.scopus.com/inward/record.url?scp=77953129653&partnerID=8YFLogxK
U2 - 10.1016/j.agwat.2010.01.024
DO - 10.1016/j.agwat.2010.01.024
M3 - Journal article
AN - SCOPUS:77953129653
SN - 0378-3774
VL - 97
SP - 1156
EP - 1164
JO - Agricultural Water Management
JF - Agricultural Water Management
IS - 8
ER -