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首页> 外文期刊>Journal of Plant Growth Regulation >Carbon-11 reveals opposing roles of auxin and salicylic acid in regulating leaf physiology, leaf metabolism, and resource allocation patterns that impact root growth in Zea mays.
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Carbon-11 reveals opposing roles of auxin and salicylic acid in regulating leaf physiology, leaf metabolism, and resource allocation patterns that impact root growth in Zea mays.

机译：Carbon-11揭示了生长素和水杨酸在调节影响玉米根系生长的叶片生理，叶片代谢和资源分配模式方面的相反作用。

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Auxin (IAA) is an important regulator of plant development and root differentiation. Although recent studies indicate that salicylic acid (SA) may also be important in this context by interfering with IAA signaling, comparatively little is known about its impact on the plant's physiology, metabolism, and growth characteristics. Using carbon-11, a short-lived radioisotope (t1/2=20.4 min) administered as 11CO2 to maize plants (B73), we measured changes in these functions using SA and IAA treatments. IAA application decreased total root biomass, though it increased lateral root growth at the expense of primary root elongation. IAA-mediated inhibition of root growth was correlated with decreased 11CO2 fixation, photosystem II (PSII) efficiency, and total leaf carbon export of 11C-photoassimilates and their allocation belowground. Furthermore, IAA application increased leaf starch content. On the other hand, SA application increased total root biomass, 11CO2 fixation, PSII efficiency, and leaf carbon export of 11C-photoassimilates, but it decreased leaf starch content. IAA and SA induction patterns were also examined after root-herbivore attack by Diabrotica virgifera to place possible hormone crosstalk into a realistic environmental context. We found that 4 days after infestation, IAA was induced in the midzone and root tip, whereas SA was induced only in the upper proximal zone of damaged roots. We conclude that antagonistic crosstalk exists between IAA and SA which can affect the development of maize plants, particularly through alteration of the root system's architecture, and we propose that the integration of both signals may shape the plant's response to environmental stress.
机译：生长素（IAA）是植物发育和根系分化的重要调节剂。尽管最近的研究表明，水杨酸（SA）在这种情况下也可能通过干扰IAA信号传导而发挥重要作用，但对其对植物的生理，代谢和生长特性的影响知之甚少。使用Carbon-11，将短寿命放射性同位素（t 1/2 = 20.4分钟）作为 11 CO 2 施用给玉米植物（B73 ），我们使用SA和IAA处理措施来衡量这些功能的变化。 IAA施用减少了总根生物量，尽管它增加了侧根的生长，但以一次根伸长为代价。 IAA介导的根系生长抑制与 11 CO 2 固定减少，光系统II（PSII）效率和 11 C-光同化物及其在地下的分配。此外，IAA的施用增加了叶片淀粉的含量。另一方面，SA的施用增加了根总生物量， 11 CO 2 固定，PSII效率和 11 C-光同化植物的叶片碳输出。 ，但降低了叶片淀粉含量。绿豆假单胞菌侵袭根草体后，还检查了IAA和SA诱导模式，以将可能的激素串扰置于现实的环境中。我们发现，在侵染后4天，IAA诱导在中部和根尖，而SA仅诱导在受损根的上部近端区域。我们得出的结论是，IAA和SA之间存在拮抗串扰，这可能会影响玉米植物的生长，特别是通过改变根系结构而影响玉米的发育，并且我们建议这两种信号的整合可能会影响植物对环境胁迫的响应。

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