Systemic Seed Treatment Uptake during Imbibition by Corn and Soybean

作者：Yang, Daibin; Avelar, Suemar A. G.; Taylor, Alan G.^*

来源：Crop Science, 2018, 58(5): 2063-2070.

DOI：10.2135/cropsci2018.01.0004

• FACILITATED DIFFUSION
• PLANT UPTAKE
• COAT
• CHEMICALS
• TRITICONAZOLE
• TRIADIMENOL
• METABOLISM
• TRANSPORT
• GLUCOSE
• BARLEY

Systemic seed treatment uptake into soybean [Glycine max (L.) Merr.] and corn (Zea mays L.) seeds during imbibition has not been investigated over a broad range of application rates. The objectives of this study were to investigate the uptake capacity of seeds and assess the role of the seed coat on uptake. A fluorescent compound, coumarin 120 (7-amino-4-methylcoumarin), was applied as a model seed treatment in the range of 0.01 to 20.0 mg g(-1) seed to study the dose effects on seed uptake of two corn lines and three soybean cultivars. In general, there was a large increase in seed uptake as dosage increased, followed by a saturated state at higher dosages. The uptake by two lines of corn seeds and three cultivars of soybean seeds showed a dose-dependent process that was described by an exponential model of Y = y(0) -Ae(-kx) (r(2) >= 0.93), where y(0) is the uptake limit, A and k are constants, and x is the applied dose rate. The value of y(0) is an indicator of a seed's uptake capacity, and it differed between the two corn lines and the three soybean cultivars. The calculated dose rate at which the uptake achieved 95% of y(0) (x(95)) also varied widely within the corn lines and soybean cultivars examined. A low value of x(95) = 0.87 mg g(-1) seed was measured for corn line B73. This result indicates that a seed treatment may reach its uptake limit at a low dosage. The seed-covering layers of corn lines and the black-seeded soybean cultivar attenuated the uptake of the seed treatment.

• 出版日期2018-10
• 单位中国农业科学院