Table 5.
Phenotypic variation in J. curcas among accessions
| Trait | Mean | Min. | Max. | SDg | CVg% | h2 (%) |
|---|---|---|---|---|---|---|
| Average seed weight (g seed−1) |
0.66 |
0.44 |
0.89 |
0.089 |
13 |
n.d. |
| Cotyledon number (#) |
2.02 |
2 |
3 |
0.009 |
0.4 |
1.4 |
| Days to cotyledon emergence (d) |
18.2 |
14.5 |
28.0 |
2.1 |
12 |
88.3 |
| Days to germination (d) |
14.8 |
11.0 |
22.0 |
1.7 |
12 |
74.8 |
| Plant height (cm) |
21.3 |
7.5 |
33.4 |
3.5 |
17 |
85.7 |
| Leaf number (#) |
12.0 |
7.0 |
17 |
0.8 |
7 |
48.0 |
| Phyllochron in days per leaf (d) |
5.1 |
2.7 |
8.3 |
0.44 |
9 |
64.3 |
| First-leaf length (cm) |
12.6 |
7.2 |
20.3 |
1.6 |
13 |
81.9 |
| First-leaf width (cm) |
11.9 |
7.2 |
19.8 |
1.9 |
16 |
83.4 |
| Leaf area average (cm2 leaf−1) |
173 |
112 |
327 |
35 |
20 |
87.8 |
| Root dry weight (g plant−1) |
1.3 |
0.4 |
2.5 |
0.29 |
23 |
70.0 |
| Petiole dry weight (g plant−1 ) ns |
1.9 |
0.8 |
3.0 |
0.20 |
10 |
39.2 |
| Stem dry weight (g plant−1) |
6.6 |
2.2 |
12.5 |
1.39 |
21 |
71.2 |
| Leaf dry weight (g plant−1) |
6.4 |
3.2 |
10.4 |
0.87 |
14 |
59.2 |
| Total plant dry weight (g plant−1) |
16.1 |
7.5 |
27.6 |
2.7 |
17 |
66.4 |
| Total leaf area (cm2 plant−1) |
2044 |
1044 |
3158 |
303 |
15 |
75.5 |
| Absolute growth rate (g d−1) |
0.27 |
0.13 |
0.47 |
0.046 |
17 |
67.5 |
| Relative Growth Rate, RGR (d−1) |
0.053 |
0.040 |
0.060 |
0.002 |
4 |
47.4 |
| Leaf Weight Ratio, LWR (%) |
40.1 |
34 |
55 |
2.0 |
5 |
62.8 |
| Specific Leaf Area, SLA (cm2 g−1) |
324 |
220 |
416 |
22 |
7 |
64.7 |
| Net Assimilation Rate, NAR (g m2 d−1) |
4.2 |
2.4 |
5.9 |
0.4 |
9 |
48.4 |
| Radiation use efficiency (g MJint−1) |
5.0 |
2.4 |
8.0 |
0.67 |
13 |
57.3 |
| Shoot/root ratio (−) |
12.5 |
8.0 |
24.4 |
1.8 |
14 |
73.7 |
| Leaves/stem ratio (−) |
1.3 |
1.0 |
2.4 |
0.14 |
11 |
69.6 |
| Petiole/leaf weight ratio (−) | 0.30 | 0.16 | 0.38 | 0.031 | 10 | 78.8 |
No significant difference between accessions for petiole dry weights (ns).
RGR, RUE and NAR differences statistically significant at p < 0.05.
Difference for all other traits statistically significant at p < 0.01.
Note: RGR = LWR*SLA*NAR (when SLA in m2 g−1 and NAR in g m2 d−1 and LWR expressed as a fraction).
Means over all accessions, minimum, maximum values of accession means, genetic standard deviation (SDg) and genetic coefficient of variation (CVg% = 100*SDg/mean), broad sense heritability (h2, for family means based on three plants per family).