Table 4. Pearson correlation coefficients among changes in phytohormones and changes in panicle traits and yield components across different varieties and heat treatments (n = 12).
Phytohormone changes | ΔYield | ΔSpikelets /panicle | ΔPB | ΔSB | ΔRSB | ΔFPB | ΔFSB | ΔRFPB | ΔRFSB | ΔSpikelet fertility | ΔExserted panicle length | ΔAnther dehiscence | ΔVigorous pollen | ΔGrain weight | ΔGrain length | ΔGrain width | ΔGrain area |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
ΔiP9G + tZ9G | −0.82** | −0.67* | −0.66* | −0.80** | 0.16 | 0.03 | −0.20 | 0.28 | 0.67* | −0.70* | −0.77** | −0.48 | −0.58* | −0.77** | −0.49 | −0.34 | −0.55 |
ΔtZ + tZR | 0.87** | 0.92** | 0.57 | 0.87** | −0.80** | 0.52 | 0.86** | −0.35 | −0.96** | 0.40 | 0.40 | 0.84** | 0.88** | 0.86** | 0.68* | −0.26 | 0.22 |
ΔiP + iPA + iPMP | 0.76** | 0.74** | 0.33 | 0.73** | −0.54 | 0.41 | 0.60* | 0.02 | −0.90** | 0.53 | 0.61* | 0.77** | 0.70* | 0.89** | 0.78** | 0.12 | 0.54 |
ΔaCTKs | 0.83** | 0.84** | 0.43 | 0.8** | −0.66* | 0.46 | 0.71** | −0.11 | −0.96** | 0.51 | 0.56 | 0.83** | 0.78** | 0.92** | 0.78** | −0.01 | 0.45 |
ΔCTKs | 0.40 | 0.57 | −0.05 | 0.40 | −0.84** | 0.75** | 0.89** | 0.13 | −0.77** | 0.02 | 0.04 | 0.77** | 0.58* | 0.59* | 0.67* | −0.40 | 0.10 |
ΔGA1 | 0.51 | 0.17 | 0.35 | 0.29 | −0.14 | 0.29 | 0.16 | 0.02 | −0.40 | 0.98** | 0.85** | 0.56 | 0.26 | 0.60* | 0.33 | 0.65* | 0.50 |
ΔIAA | 0.75** | 0.53 | 0.49 | 0.56 | −0.60* | 0.67* | 0.66* | −0.27 | −0.65* | 0.79** | 0.58* | 0.88** | 0.66* | 0.72** | 0.49 | 0.10 | 0.17 |
ΔABA | 0.72** | 0.69* | 0.57 | 0.74** | −0.42 | 0.17 | 0.51 | −0.50 | −0.51 | 0.31 | 0.17 | 0.46 | 0.66* | 0.43 | 0.42 | −0.33 | −0.19 |
*And **indicate significant Pearson correlation at the P < 0.05 and P < 0.01 level (two-tailed), respectively. Δ, change in trait was defined as the difference of the value under high temperature treatment from the value under the control. FPB, number of differentiated florets on primary branches; FSB, number of differentiated florets on secondary branches; PB, number of differentiated primary branches; RFPB, number of retrograded florets on primary branches; RFSB, number of retrograded florets on secondary branches; RSB, number of retrograded secondary branches; SB, number of differentiated secondary branches.