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Dear all, </div>
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Please join us in Marley 230 on Tuesday, Nov. 5 at 4:00 PM for a seminar presented by Kelsey Pryze from the School of Plant Sciences, University of Arizona. </div>
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<span style="color: rgb(5, 99, 193);"><u><a href="https://arizona.zoom.us/j/83044711714?pwd=IQ994mWIPwbsRKMnfF9sERx5sNtv4m.1" target="_blank" id="OWAc1c54ab6-41e9-2adc-06dd-1f8f22bc0976" class="Hyperlink SCXW4745064 BCX8 OWAAutoLink" rel="noreferrer noopener" style="color: rgb(5, 99, 193); margin: 0px;">Zoom
link</a></u></span><span style="color: rgb(0, 0, 0);">: https://arizona.zoom.us/j/83044711714 (password: SPLS24). </span></div>
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Refreshments will be provided in the Marley Lobby at 3:30 PM. </div>
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<b>Title: Regulating cell wall modifications and ROS homeostasis: Key thermotolerance mechanisms in tomato pistils </b> </div>
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<img width="156" height="214" size="304159" contenttype="image/png" style="width: 156px; height: 214px; margin: 0px;" data-outlook-trace="F:1|T:1" src="cid:760f0a4b-80c7-4698-8b86-65aa4d743962"> Pollen tube growth
<i>in vivo</i> in a pistil.</div>
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<b>Abstract</b>: Cultivated tomatoes experience significant decreases in fruit and seed yields when exposed to heat stress, a critical issue as global temperatures rise. Our studies have revealed that this susceptibility arises when the pollen tube growth stage
is subjected to heat stress, reaching 37°C for 8-12 hours, even when all other phases of reproductive development occur under controlled conditions. Within the
<i>Solanum lycopersicum</i> species (tomato), considerable variation exists, resulting in thermotolerance in specific naturally occurring cultivars. To investigate this further, we conducted studies using the economically important yet thermosensitive cultivar
Heinz alongside three thermotolerant cultivars: Malintka, Nagcarlang, and Tamaulipas. We aimed to analyze their transcriptional responses to heat stress and identify genes that may confer resilience to heat stress in the pistil, which is essential for facilitating
pollen tube growth. Transcriptomic analyses revealed genes differentially expressed in the three thermotolerant cultivars under heat stress but remained unresponsive to heat stress in Heinz. These genes include cell wall-modifying enzyme genes and those involved
in reducing reactive oxygen species, which could aid thermotolerant pistils in creating a more conducive environment for pollen tube growth under heat stress and enhance seed and fruit yields. We propose that cell wall modifiers and regulators of ROS levels
in pistils are potential targets for improving reproductive thermotolerance in tomatoes. </div>
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<p style="margin-bottom: 12pt;"><span style="font-family: "Courier New"; font-size: 10pt;">===============================================================<br>
</span><span style="font-family: "Vladimir Script"; font-size: 20pt;"><b>Zhongguo Xiong</b></span><span style="font-family: "Courier New"; font-size: 10pt;"> <br>
School of Plant Sciences BIO5 Institute<br>
BIO5 Email: </span><span style="font-family: "Courier New"; font-size: 10pt; color: blue;"><a href="mailto:zxiong@arizona.edu" id="OWAc12ff8ba-c262-88d2-2950-7f01e824e2ea" class="OWAAutoLink" style="margin-top: 0px; margin-bottom: 0px;">zxiong@arizona.edu</a></span><span style="font-family: "Courier New"; font-size: 10pt;">
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Phone: (520)-621-9869<br>
Forbes 303, P.O. box 210036 Fax: (520)-621-7186<br>
University of Arizona <br>
Tucson, AZ 85721-0036 </span><span style="font-family: "Courier New"; font-size: 10pt; color: blue;"><a href="http://ag.arizona.edu/~zxiong" id="OWAe285e878-c2f0-08a4-4be7-2b2355d20c3a" class="OWAAutoLink" style="margin-top: 0px; margin-bottom: 0px;">http://ag.arizona.edu/~zxiong</a></span><span style="font-family: "Courier New"; font-size: 10pt;"><br>
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