Table 3.
Shoot/root ratio, nodule number and plant-nitrogen (N) content of cowpea varieties under different available soil-phosphate (Pi) levels (low available soil-Pi, moderate available soil-Pi, and high available soil-Pi) and soil water conditions (WW, well-watered; WD, water deficit).
| Low soil-Pi | Moderate soil-Pi | High soil-Pi | ||||
|---|---|---|---|---|---|---|
| WD | WW | WD | WW | WD | WW | |
| SHOOT/ROOT RATIO [(g DM shoot)/(g DM root)] | ||||||
| Dan'Ila | 4.4 ± 0.4 Aa | 5.6 ± 0.9 Aa | 3.8 ± 0.6 Aa | 5.1 ± 0.1 Ba | 1.7 ± 0.3 Bcb | 5.6 ± 0.6 Ca |
| IT04K-339-1 | 1.3 ± 0.3 Db | 4.7 ± 0.7 Aa | 1.7 ± 0.2 CDb | 4.3 ± 0.3 Ca | 2.5 ± 0.1 Bb | 6.1 ± 0.3 Ca |
| IT04K-405-5 | 2.1 ± 0.2 Cb | 4.5 ± 0.8 Aa | 1.5 ± 0.1 CDb | 4.1 ± 0.4 Ca | 5.9 ± 1.2 Aa | 5.0 ± 0.7 Ca |
| IT06K-281-1 | 3.2 ± 0.4 Bb | 5.0 ± 0.8 Aa | 1.5 ± 0.5 CDb | 5.0 ± 0.3 Ba | 2.6 ± 0.8 Bb | 5.8 ± 0.6 Ca |
| IT07K-187-24 | 1.6 ± 0.4 Cb | 3.3 ± 0.2 Ba | 2.3 ± 0.8 Bcb | 6.4 ± 1.1 ABa | 1.5 ± 0.8 Bcb | 5.3 ± 0.6 Ca |
| IT07K-188-49 | 2.0 ± 0.4 Cb | 5.5 ± 0.9 Aa | 1.9 ± 0.2 Cb | 7.8 ± 1.0 Aa | 1.5 ± 0.2 Cb | 6.3 ± 1.0 Bca |
| IT07K-304-9 | 1.0 ± 0.2 Db | 4.6 ± 0.8 Aa | 1.9 ± 0.1 Cb | 6.5 ± 1.2 ABa | 4.4 ± 0.4 Ab | 7.9 ± 0.9 ABa |
| IT97K-499-35 | 2.7 ± 0.5 Bcb | 4.8 ± 0.3 Aa | 1.3 ± 0.3 Db | 7.6 ± 1.2 ABa | 2.4 ± 0.8 Bcb | 8.7 ± 0.5 Aa |
| TVU7778 | 2.3 ± 0.1 Cb | 5.3 ± 0.1 Aa | 2.7 ± 0.2 Ba | 5.7 ± 0.7 Ba | 2.1 ± 0.3 Bb | 5.0 ± 0.7 Ca |
| NODULE NUMBER [plant−1] | ||||||
| Dan'Ila | 0.0 ± 0.0 Bb | 17.2 ± 2.5 Ba | 0.0 ± 0.0 Bb | 31.2 ± 3.9 Ba | 0.0 ± 0.0 Bb | 62.5 ± 7.3 Aa |
| IT04K-339-1 | 0.0 ± 0.0 Bb | 12.3 ± 1.6 Ca | 0.0 ± 0.0 Bb | 14.0 ± 3.6 Da | 3.2 ± 0.3 Ab | 36.7 ± 2.7 Ca |
| IT04K-405-5 | 0.8 ± 0.1 Ab | 22.3 ± 1.6 Aa | 0.0 ± 0.0 Bb | 57.3 ± 5.7 Aa | 0.0 ± 0.0 Bb | 69.2 ± 5.1 Aa |
| IT06K-281-1 | 0.0 ± 0.0 Bb | 7.2 ± 0.1 Da | 0.0 ± 0.0 Bb | 15.5 ± 4.5C Da | 0.0 ± 0.0 Bb | 43.5 ± 1.8 Ba |
| IT07K-187-24 | 0.0 ± 0.0 Bb | 11.3 ± 2.3 Ca | 2.2 ± 0.2 Ab | 12.3 ± 2.2 Da | 0.0 ± 0.0 Bb | 29.0 ± 2.0 Da |
| IT07K-188-49 | 0.0 ± 0.0 Bb | 5.3 ± 0.6 Da | 0.0 ± 0.0 Bb | 12.0 ± 3.5 Da | 0.0 ± 0.0 Bb | 11.3 ± 1.4 Ea |
| IT07K-304-9 | 0.0 ± 0.0 Bb | 15.2 ± 1.3 Bca | 0.0 ± 0.0 Bb | 29.7 ± 3.2 Ba | 0.0 ± 0.0 Bb | 67.0 ± 5.5 Aa |
| IT97K-499-35 | 0.0 ± 0.0 Bb | 6.0 ± 1.9 Da | 0.0 ± 0.0 Bb | 9.8 ± 1.3 Da | 0.0 ± 0.0 Bb | 24.7 ± 2.3 Da |
| TVU7778 | 0.0 ± 0.0 Bb | 17.7 ± 2.2 Ba | 0.0 ± 0.0 Bb | 21.3 ± 2.1 Ca | 0.0 ± 0.0 Bb | 38.0 ± 3.1 Bca |
| PLANT-N CONTENT [mg N plant−1] | ||||||
| Dan'Ila | 8.0 ± 0.9A Bb | 47.5 ± 2.3 Aa | 14.7 ± 1.4 Bb | 78.7 ± 5.2 Aa | 13.2 ± 1.2 Cb | 100.2 ± 7.1 ABa |
| IT04K-339-1 | 6.2 ± 1.1 Bcb | 40.7 ± 1.9 Ba | 9.0 ± 0.2 Cb | 52.8 ± 4.7 Ca | 12.8 ± 0.3 Cb | 77.9 ± 2.7 Ca |
| IT04K-405-5 | 9.1 ± 0.2 Ab | 52.5 ± 2.9 Aa | 16.7 ± 0.3 Ab | 70.0 ± 5.6 Aa | 23.9 ± 0.3 Bb | 100.3 ± 4.7 Aa |
| IT06K-281-1 | 6.8 ± 1.1 Bcb | 29.5 ± 1.1 Da | 10.8 ± 0.5 Cb | 48.0 ± 1.4 Da | 13.3 ± 1.2 Cb | 86.4 ± 7.7 Bca |
| IT07K-187-24 | 6.9 ± 0.3 Bcb | 40.3 ± 2.7 Ba | 9.3 ± 0.7 Cb | 67.8 ± 3.9 Ba | 11.5 ± 1.3 Cb | 84.8 ± 5.1 Ba |
| IT07K-188-49 | 4.6 ± 0.8 Db | 10.6 ± 2.8 Ea | 5.8 ± 0.9 Db | 65.4 ± 3.5 Ba | 11.4 ± 1.2 Cb | 72.3 ± 3.5C Da |
| IT07K-304-9 | 5.9 ± 0.9 CDb | 37.4 ± 3.2 Bca | 10.6 ± 1.1 Cb | 51.5 ± 3.1 Da | 26.6 ± 1.9 Ab | 62.2 ± 1.3 Ea |
| IT97K-499-35 | 7.0 ± 0.5 Bcb | 33.8 ± 1.6 Ca | 9.4 ± 0.2 Cb | 47.8 ± 2.5 Da | 13.9 ± 0.6 Cb | 69.4 ± 1.0 Da |
| TVU7778 | 7.1 ± 1.4 Bcb | 29.4 ± 1.7 Da | 9.8 ± 0.4 Cb | 59.5 ± 4.8 Bca | 13.1 ± 1.0 Cb | 86.2 ± 2.1 Ba |
Mean values and standard errors are shown (n = 4). Different small letters indicate significant differences between the WD and WW plants for each variety at each available soil-Pi level (Fisher's test; p < 0.05). Different capital letters indicate significant differences among the varieties at each available soil-Pi level and WD conditions (Fisher's test; p < 0.05). DM, dry matter.