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Table 5 Correlation analyses between 2AP content in brown rice and the investigated parameters

From: Nitrogen application and different water regimes at booting stage improved yield and 2-acetyl-1-pyrroline (2AP) formation in fragrant rice

Index FH 7 d AFH 14 d AFH 21 d AFH MS
2AP
 grain   0.2147 ns 0.2812a 0.5429b 0.7498b
 leaf 0.3890b 0.6964b 0.1884 ns 0.1342 ns 0.2631 ns
 Stem-sheath − 0.6084b − 0.3214a − 0.6450b 0.6214b 0.2021 ns
Proline
 Grain   0.3932b 0.1677 ns −0.223 ns − 0.2222 ns
 Leaf 0.1045 0.5046b −0.0224 −0.6608b − 0.4014b
 Stem-sheath 0.4646b 0.5116b 0.6379b 0.4770b −0.1290 ns
 Root 0.5538b 0.2828a 0.1685 ns 0.2453 ns 0.0726 ns
P5C
 Grain   −0.0523 ns 0.2554 ns 0.2870a 0.3595b
 Leaf 0.2937 ns 0.4995b 0.4389b 0.1976 ns 0.0345 ns
 Stem-sheath 0.3997b 0.4860b 0.4826b 0.4271b 0.4858b
 Root 0.4400b 0.5269b 0.3002a 0.4625b 0.4085b
PDH
 Grain   0.1834 ns 0.0236 ns 0.1666 ns −0.2187 ns
 Leaf −0.0700 ns 0.3822b 0.0587 ns 0.2778a −0.1782 ns
 Stem-sheath 0.5317b 0.3289a −0.1446 ns 0.4552b 0.0974 ns
 Root 0.5641b 0.1983 ns 0.0040 ns 0.2589 ns 0.2439 ns
P5CS
 Grain   0.1147 ns 0.3975b 0.5407b 0.3103a
 Leaf 0.2743 ns 0.3494b 0.0739 ns −0.0577 ns −0.2724a
 Stem-sheath 0.3929b 0.7658b 0.2302 ns 0.5854b 0.1644 ns
 Root 0.2960a 0.5961b 0.4466b 0.5879b 0.1445 ns
DAO
 Grain   −0.0112 ns −0.1510 ns −0.5052b − 0.3963b
 Leaf −0.0805 ns − 0.3096a 0.1360 ns 0.0167 ns −0.2337 ns
 Stem-sheath 0.0397 ns −0.3492b 0.1060 ns −0.0642 ns −0.6041b
 Root 0.2525 ns −0.4732b −0.0649 ns − 0.2147 ns −0.1632 ns
OAT
 Grain   −0.6194b −0.3658b − 0.4099b −0.1367 ns
 Leaf −0.0063 ns 0.0322 ns −0.0834 ns 0.0025 ns 0.2044 ns
 Stem-sheath 0.4662b 0.1237 ns −0.3382a −0.2943a 0.3043a
 Root 0.2406 ns −0.0471 ns −0.4170b − 0.2384 ns −0.0278 ns
  1. FH, Full heading stage; 7d AFH, 7d after full heading; 14 d AFH, 14d after full heading; 21 d AFH, 21d after full heading; MS, Maturity stage
  2. ns, not significant at the 0.05 probability level; a and b, significant at the 0.05 and 0.01 probability levels, respectively