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Table 2 The four major components (PC1, PC2, PC3, and PC4) and PCA ranking of each ryegrass genotypes based on turf quality (TQ), photochemical efficiency (Fv/Fm), chlorophyll content (Chl), photosynthesis rate (Pn), water use efficiency (WUE), electrolyte leakage (EL), leaf relative water content (RWC), and root activity (RA)

From: Natural variation of physiological traits, molecular markers, and chlorophyll catabolic genes associated with heat tolerance in perennial ryegrass accessions

Accession No. PC1 PC2 PC3 PC4 PCA value Rank
275,660 299.1 10.4 128.3 50.7 173.95 1
598,892 282.5 16.2 142.3 84.7 169.99 2
277,846 268.9 −28.5 109.0 46.4 148.22 3
516,605 242.4 9.7 156.2 75.7 148.06 4
598,443 239.6 31.2 140.9 49.6 147.79 5
610,802 261.1 −33.9 118.7 75.9 145.94 6
231,565 245.7 −19.2 136.5 95.8 143.69 7
303,026 194.6 0.9 169.4 101.1 123.97 8
231,605 207.8 −20.7 140.7 71.7 122.03 9
182,857 171.5 −3.3 188.3 116.8 113.60 10
265,342 184.8 −26.5 177.2 96.3 113.53 11
251,224 170.8 5.3 180.9 80.8 111.81 12
577,254 160.9 16.0 182.5 80.1 108.85 13
231,604 167.9 −13.3 163.7 90.9 105.78 14
266,293 167.9 −11.2 160.2 77.9 104.98 15
598,839 129.8 60.5 187.4 109.5 104.04 16
303,037 182.0 −43.0 135.9 70.6 103.42 17
418,722 157.7 2.0 162.7 67.4 101.77 18
303,028 149.0 −14.4 180.1 83.8 96.43 19
237,187 146.3 −23.3 167.8 82.4 92.11 20
418,712 117.3 20.0 193.7 100.2 89.07 21
371,952 140.9 −41.5 183.4 109.4 88.79 22
267,058 137.9 −34.3 184.0 96.4 87.80 23
284,826 132.4 −11.1 172.7 73.1 87.02 24
505,842 135.1 −27.4 178.8 88.2 86.68 25
600,878 140.6 −49.0 176.7 103.7 86.10 26
418,736 114.5 10.1 197.9 91.7 85.29 27
274,637 137.6 −45.1 179.2 95.3 84.92 28
285,101 124.5 −13.6 185.9 81.5 84.03 29
578,763 109.4 19.2 170.4 81.5 81.49 30
225,825 111.7 −37.7 202.4 115.7 76.18 31
619,003 98.0 4.3 199.2 99.5 76.07 32
298,091 113.7 −30.4 181.0 93.0 75.31 33
418,741 97.6 −0.5 192.6 108.4 74.99 34
418,726 114.5 −22.4 163.6 79.6 74.99 35
418,723 98.6 −9.3 200.4 108.4 74.38 36
610,965 115.6 −26.8 156.0 81.2 74.17 37
267,059 80.9 19.7 225.7 112.7 73.38 38
403,907 101.8 −27.3 189.6 101.0 70.95 39
204,880 90.8 −21.1 207.6 105.2 68.21 40
610,926 99.2 −53.4 212.1 122.8 67.69 41
418,721 82.3 −6.4 209.3 104.9 66.85 42
265,351 88.4 −31.8 187.3 109.6 63.40 43
231,606 92.2 −50.6 197.8 101.9 61.90 44
303,020 75.8 −15.7 187.1 94.7 58.97 45
198,070 83.0 −25.4 168.9 88.7 58.85 46
628,717 76.7 −39.8 207.7 102.3 56.77 47
306,292 73.4 −43.5 215.0 125.5 56.55 48
290,368 75.4 −55.9 214.5 121.1 54.73 49
265,340 56.2 −8.7 207.8 114.2 53.17 50
287,855 42.8 −4.7 242.3 132.5 51.09 51
197,270 25.1 −1.8 262.8 143.8 44.85 52
502,412 44.7 −17.8 194.8 102.1 43.29 53
284,823 50.2 −54.1 213.9 125.3 42.07 54
634,205 39.2 1.7 158.3 87.2 40.30 55
238,938 13.5 −16.6 274.8 153.7 37.42 56
321,397 42.2 −29.2 167.4 101.4 37.39 57
231,576 43.0 −42.0 178.8 100.6 36.06 58
231,595 24.1 −27.5 215.9 119.6 33.46 59
319,018 32.6 −45.5 203.5 116.1 32.99 60
420,126 23.3 −50.2 238.8 140.2 31.79 61
254,898 13.3 −22.7 223.5 133.6 30.39 62
202,451 11.9 −16.4 205.8 113.2 27.99 63
268,333 4.0 −14.2 235.3 127.4 27.76 64
598,434 24.7 −41.1 189.3 102.4 27.61 65
287,849 −12.4 −19.8 270.1 157.8 23.04 66
278,773 17.2 −29.3 158.4 84.2 22.20 67
547,390 −13.2 −19.6 262.5 159.2 22.11 68
231,580 1.3 −23.9 203.9 118.4 21.13 69
440,474 −33.7 21.5 253.8 141.0 17.69 70
204,085 −26.5 −20.6 284.0 165.4 17.13 71
403,868 −11.3 −28.7 216.3 126.5 15.09 72
598,911 −56.4 11.4 321.2 179.9 11.99 73
376,878 −41.5 −18.3 272.5 159.7 8.33 74
420,128 −33.3 −34.1 259.2 155.7 8.07 75
418,714 −49.3 2.5 234.9 133.0 3.47 76
418,707 −46.7 − 41.8 271.7 163.4 0.96 77
231,566 −53.4 −49.2 304.0 189.2 0.45 78
410,155 −38.5 −62.2 267.8 153.9 0.17 79
619,474 −61.4 −31.3 304.9 184.6 −0.36 80
577,273 −85.5 −3.0 284.4 170.6 −9.95 81
632,542 −81.0 −13.6 272.1 163.7 −11.27 82
265,344 −82.3 −47.0 283.7 182.6 −16.47 83
311,075 −93.3 −17.7 257.2 160.0 −20.10 84
206,376 − 116.3 1.2 284.7 174.5 −25.06 85
277,848 −109.2 −48.9 316.5 203.2 −26.84 86
423,136 − 108.7 −63.1 323.2 211.5 −28.32 87
610,950 −113.6 −13.9 260.8 153.3 −30.17 88
220,178 − 137.9 −45.4 377.7 250.5 −32.80 89
204,879 −123.2 −45.0 317.4 199.0 −33.66 90
577,251 −121.2 −45.1 294.4 184.2 −35.60 91
577,269 − 129.7 −55.1 324.2 209.2 −37.87 92
231,567 − 148.4 −65.1 398.0 261.8 −39.87 93
303,027 − 174.1 5.5 350.1 226.2 −45.53 94
239,730 − 151.2 − 42.2 330.8 214.0 −45.67 95
317,452 −187.5 −1.8 385.2 239.0 −50.24 96
321,681 −151.0 −20.3 258.6 168.4 −50.31 97
538,976 −290.2 −10.9 399.8 278.6 − 102.20 98