Table 1. A Comparison of Temperature Effects on Meiosis in Barley.

Phenotype	22°C	30°C
Duration of premeiotic S-phase DNA replication	<13 h	<9 h
Duration of meiosis (G2 to tetrad)	43 h	43 h
Cycles of expansion and contraction	Normal	Normal
Axis formation (ASY1 loading)	Polarized	Less polarized
Synapsis (ZYP1 loading)	Normal	Loading defect
Bivalent type (rings:rods)	32:1 (n = 50)	8:1 (n = 128)
Ratio of distal:interstitial chiasmata	25:1 (n = 50)	11:1 (n = 128)
Seed set (mean per stem)	22.7 (n = 15)	1.5 (n = 21)