. 2022 Jan 18;23(3):1031. doi: 10.3390/ijms23031031

Table 1.

The influence of foliage treated with 0, 0.4, 0.8, 1.2, 1.6, or 2.0 mM ethephon at 15 DAS on net photosynthesis, stomatal conductance, intercellular CO₂ concentration, SPAD value, and maximal quantum yield of PSII efficiency (Fv/Fm) in Taipei-309 and Rasi cultivars of rice (Oryza sativa L.) at 30 DAS. Data are presented as treatment means ± SE (n = 4). Data followed by the same letter are not significantly different by the LSD test at p < 0.05. DAS, days after sowing.

Ethephon (mM)	Cultivars	Net Photosynthesis (µmol CO₂ m⁻² s⁻¹)	Stomatal Conductance (mol m⁻² s⁻¹)	Intercellular CO₂ Concentration (µmol CO₂ mol⁻¹)	SPAD Value	Maximal Quantum Yield of PSII Efficiency (Fv/Fm)
0	Taipei-309	16.8 ± 0.8 ^de	0.33 ± 0.011 ^efg	193.8 ± 11.5 ^bcd	37.5 ± 1.24 ^cde	0.804 ± 0.020 ^bcd
0	Rasi	15.2 ± 0.7 ^ef	0.27 ± 0.007 ^hi	187.2 ± 10.0 ^cd	34.7 ± 1.15 ^de	0.791 ± 0.019 ^cde
0.4	Taipei-309	19.9 ± 0.9 ^c	0.37 ± 0.015 ^cde	215.6 ± 14.2 ^abcd	39.1 ± 1.28 ^cd	0.830 ± 0.033 ^abc
0.4	Rasi	18.7 ± 0.8 ^cd	0.31 ± 0.011 ^fgh	198.5 ± 11.9 ^bcd	35.9 ± 1.20 ^de	0.811 ± 0.032 ^bcd
0.8	Taipei-309	21.2 ± 1.0 ^bc	0.42 ± 0.019 ^b	229.3 ± 15.7 ^ab	40.9 ± 1.38 ^abc	0.859 ± 0.021 ^abc
0.8	Rasi	19.1 ± 0.9 ^cd	0.35 ± 0.012 ^def	219.7 ± 14.5 ^abc	37.2 ± 1.22 ^cde	0.826 ± 0.020 ^abc
1.2	Taipei-309	23.6 ± 1.1 ^ab	0.48 ± 0.021 ^a	240.7 ± 16.4 ^a	42.7 ± 1.40 ^ab	0.871 ± 0.017 ^ab
1.2	Rasi	20.4 ± 1.0 ^bc	0.39 ± 0.016 ^bcd	227.5 ±15.5 ^ab	38.4 ± 1.26 ^cd	0.841 ± 0.016 ^abc
1.6	Taipei-309	25.3 ± 1.2 ^a	0.50 ± 0.023 ^a	251.6 ± 16.5 ^a	44.2 ± 1.44 ^a	0.892 ± 0.022 ^a
1.6	Rasi	21.8 ± 1.0 ^bc	0.41 ± 0.017 ^bc	231.9 ± 16.4 ^ab	39.6 ± 1.32 ^bc	0.853 ± 0.021 ^abc
2.0	Taipei-309	14.4 ± 0.7 ^ef	0.29 ± 0.009 ^gh	187.8 ± 10.0 ^cd	33.8 ± 1.17 ^e	0.776 ± 0.019 ^de
2.0	Rasi	12.7 ± 0.6 ^f	0.23 ±0.005 ⁱ	176.4 ± 9.7 ^d	28.5 ± 1.12 ^f	0.759 ± 0.019 ^e