Table 2. Polyamine effects on the maximum grain filling rate (Gmax), mean grain filling rate (Gmean), and maximum grain weight (Wmax) of winter wheat.
Zhoumai 18 | Xinong 538 | |||||||
S1 | S2 | P1 | CK | S1 | S2 | P1 | CK | |
Gmax (mg per grain d−1) | 2.74a | 2.73a | 2.23b | 2.28b | 2.16a | 2.16a | 1.86b | 1.84b |
Gmean (mg per grain d−1) | 2.15a | 2.15a | 1.95b | 1.94b | 1.76a | 1.77a | 1.42b | 1.40b |
Wmax (mg) | 52.6a | 52.5a | 49.4b | 48.5b | 42.3a | 42.3a | 39.4b | 39.8b |
Values in each row for the same cultivar followed by different letters are significantly different at P = 0.05. S1: external application of Spd on panicles; S2: external application of Spm on panicles; P1: external application of Put on panicles.