Table 2.
Biomass values obtained from pot-cultivated host plants and O. minor races in dry weight, showing the relative abundance of three developmental stages of parasite infection (A) and the partitioning of biomass between host shoots and roots (B)
| (A) Mean parasite biomass | |||
|---|---|---|---|
| Treatment (n = 10) | Tubercles (mg host−1; ± s.e.) | ‘Spiders’ (mg host−1; ± s.e.) | Floral buds (host−1; ± s.e.) |
| O. minor ssp. maritima on sea carrot | 16·50 ± 0·002 | 60·00 ± 0·002 | 126·6 ± 0·012 |
| O. minor var. minor on sea carrot | 0·40 ± 0·001 | 27·70 ± 0·003 | 37·0 ± 0·006 |
| O. minor ssp. maritima on red clover | – | – | – |
| O. minor var. minor on red clover | 6·40 ± 0·002 | 21·10 ± 0·004 | 149·8 ± 0·030 |
| (B) Mean host biomass | |||
| Treatment (n = 10) | Shoot (g; ± s.e.) | Roots (g; ± s.e.) | Shoot : root |
| Sea carrot infected with O. minor ssp. maritima | 8·39 ± 0·40 | 6·32 ± 0·18 | 1·33 |
| Sea carrot infected with O. minor var. minor | 8·55 ± 0·17 | 6·31 ± 0·13 | 1·35 |
| Uninfected sea carrots | 8·69 ± 0·27 | 6·44 ± 0·26 | 1·35 |
| Red clover infected with O. minor ssp. maritima | – | – | – |
| Red clover infected with O. minor var. minor | 6·88 ± 0·26 | 5·80 ± 0·10 | 1·19 |
| Uninfected red clover | 7·96 ± 0·39 | 6·22 ± 0·19 | 1·28 |
Biomass was harvested 16 weeks after inoculation.