کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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2056980 | 1075854 | 2010 | 5 صفحه PDF | دانلود رایگان |
Grain sorghum (Sorghum bicolor) crop yield is significantly compromised by high temperature stress-induced male sterility, and is attributed to reduced cell wall invertase (CWI)-mediated sucrose hydrolysis in microspores and anthers leading to altered carbohydrate metabolism and starch deficiency in pollen ( Jain et al., 2007). Sorghum plants were grown under season-long ambient (30/20 °C day-time maximum/night-time minimum) or high temperature stress (HS, 36/26 °C) environments, or reciprocally transferred for 5–10 days between either temperature regimens through panicle and microspore developmental stages. Quantitative RT-PCR analyses for CWI gene SbIncw1, plasma membrane H+-ATPase (Mha1) and sugar transporter proteins (OsSUT3 and OsMST7 homologs in sorghum), starch deficiency and pollen sterility data are presented to confirm HS-sensitivity of pre- and post-meiotic stages of sorghum microsporogenesis. Heat stress-induced reduction in Incw transcriptional activity during microspore meiosis was irreversible despite return of optimal growth temperature conditions through further reproductive development.
Journal: Journal of Plant Physiology - Volume 167, Issue 7, 1 May 2010, Pages 578–582