A high- and low-temperature inducible Arabidopsis thaliana HSP101 promoter located in a nonautonomous mutator-like element.

Transcriptional activity of a 573-bp fragment of HSP101 (At1g74310) incorporated into a Mutator-like element (MULE) transposon was investigated in Arabidopsis thaliana Columbia. Sequence identity between the HSP101-MULE arrangement and a continuous segment of the original HSP101 promoter, 5' UTR exon, and open reading frame (ORF) was high (87%) but lower in the 5' UTR intron (69%). Collectively, the HSP101 ORF, the MULE 5' terminal inverted repeat (TIR), and the 1.

High temperature stress of Brassica napus during flowering reduces micro- and megagametophyte fertility, induces fruit abortion, and disrupts seed production.

High temperature stress (HTS), during flowering, decreases seed production in many plants. To determine the effect of a moderate HTS on flowering, fruit and seed set in Brassica napus, plants were exposed to a HTS (8/16 h dark/light, 18 degrees C night, ramped at 2 degrees C h-1, over 6 h, to 35 degrees C for 4 h, ramped at 2 degrees C h-1 back to 23 degrees C for 6 h) for 1 or 2 weeks after the initiation of flowering. Although flowering on the HTS-treated plants, during both the 1 week and 2 week HTS treatments, was equal to that of control-grown plants, fruit and seed development, as well as seed weight, were significantly reduced.