Table 1.

Number of xylem vessels per visual field in shoots (n = 5), trunks (n = 5) and roots (n = 5) of ‘Nemaguard’, ‘P30-135’ and ‘K146-43’ rootstock genotypes

Rootstock	Shoot	Trunks	Roots
‘Nemaguard’	30·80 ± 0·68c	17·97 ± 1·39c	20·15 ± 0·80c
‘P30-135’	39·66 ± 1·71b	25·07 ± 0·98b	30·75 ± 0·27b
‘K146-43’	53·47 ± 0·85a	50·50 ± 2·11a	40·55 ± 1·69a

For shoots each value is the mean of two visual fields from two sections per three shoots from five trees ± s.e. (n = 5). For trunks each value is the mean of two visual fields from four sections from five trees ± s.e. (n = 5). For roots each value is the mean of two visual fields from two sections per three roots from five trees ± s.e. (n = 5). Means with different lower-case letters are significantly different at P < 0·05 (Tukey test).