Fig. 6

6.1 A. Spike of Laxatum-a (lax-a.8) at early maturity compared with normal Bowman. In lax mutants the rachis internodes are typically 10 to 20% longer than in their corresponding mother cultivars. Combined with thin and small kernels this results in a very sparse spike. The exposed caryopses are shown in the kernels of the lax-a.8 mutant. B. The awns of lax mutants have a very wide base, without a distinct notch in the lemma attachment region. Four kernels of lax-c.21 to the left compared to Bowman. 6.2 A. Mutant Long basal rachis internode 3 (lbi3.c) in a Bowman genetic background to the left with typical elongated basal rachis internode, which is approximately ten times longer than that of Bowman (right). The lbi3.c mutation was originally isolated from the six-rowed cultivar Montcalm. In a Montcalm genetic background the basal rachis internode can be more than 10 cm [71]. B. The slightly curled or wavy basal rachis internode of Accordion rachis 1 (acr1.a) to the left compared to Bowman. The arrows point at the basal rachis internodes