Table 2.
Summary of the dry matter accumulation model and the parameters of wheat grain after short LT treatment during the booting stage.
| Cultivar | Treatment | Model | Decision coefficient (R2) | T1 (d) | T2 (d) | T3 (d) | Tmax (d) | T (d) | R (g.1000grain−1.d−1) | Rmax (g.1000grain−1.d−1) |
|---|---|---|---|---|---|---|---|---|---|---|
| Yangmai 18 | Control | Y = 51.0948/[1 + e(2.8665−0.162143t)] | 0.9969** | 9.5564 | 16.2449 | 5.4287 | 17.6788 | 31.2300 | 1.6361 | 2.0712 |
| 2°C | Y = 48.3310/[1 + e(2.9566−0.168596t)] | 0.9986** | 9.7250 | 15.6231 | 5.2209 | 17.5366 | 30.5691 | 1.5810 | 2.0371 | |
| 0°C | Y = 49.6990/[1 + e(3.0789−0.160819t)] | 0.9997** | 10.9558 | 16.3787 | 5.4734 | 19.1451 | 32.8078 | 1.5149 | 1.9981 | |
| −2°C | Y = 46.6021/[1 + e(3.3224−0.173897t)] | 0.9987** | 11.5321 | 15.1469 | 5.0618 | 19.1056 | 31.7408 | 1.4682 | 2.0260 | |
| Yannong 19 | Control | Y = 52.6116/[1 + e(2.9721−0.163389t)] | 0.9986** | 10.1298 | 16.1210 | 5.3873 | 18.1903 | 31.6381 | 1.6629 | 2.1490 |
| 2°C | Y = 51.9728/[1 + e(2.9072−0.147275t)] | 0.9935** | 10.7975 | 17.8849 | 5.9767 | 19.7399 | 34.6591 | 1.4995 | 1.9136 | |
| 0°C | Y = 49.9081/[1 + e(3.0761−0.154589t)] | 0.9989** | 11.3792 | 17.0387 | 5.6940 | 19.8986 | 34.1119 | 1.4631 | 1.9288 | |
| −2°C | Y = 48.5157/[1 + e(2.9530−0.146178t)] | 0.9990** | 11.1918 | 18.0191 | 6.0216 | 20.2014 | 35.2326 | 1.3770 | 1.7730 |
Control: wheat plants grown without LT stress; 2, 0, and −2°C: wheat plants were placed in an artificial climate chamber during the booting stage for 24 h. The temperature was set to 5°C during 07:00–19:00 and 2, 0, and −2°C during 19:00–07:00.
Y: the weight of 1,000 grains. t: the day after anthesis. T1, T2, and T3: the duration of grain filling increasing period, the fast increasing period, and slow increasing period. Tmax: the time of maximum grain filling rate. T: the time of maximum dry matter mass in grain. R: average grain filling rate. Rmax: maximum grain filling rate.
indicate significant differences at the 0.01 level.