Ethylene inhibits rice root elongation in compacted soil via ABA- and auxin-mediated mechanisms.
Ethylene inhibits rice root elongation in compacted soil via ABA- and auxin-mediated mechanisms.
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DOI：
10.1073/pnas.2201072119
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发表时间：
2022-07-26
影响因子：
11.1
通讯作者：
中科院分区：
文献类型：
--
作者：
集约化农业和不断变化的耕作方式导致土壤变得越来越紧实。坚硬的土壤会导致根部积累激素乙烯，从而导致根部伸长减少，径向膨胀加剧。我们证明，乙烯通过不同的下游信号、生长素和脱落酸(ABA)来调节这些不同的根生长反应。在根紧实反应中，生长素主要是用来减少细胞伸长的，而ABA则促进径向细胞的扩张。径向膨胀最初被认为有助于根在坚硬土壤中的渗透，然而水稻ABA缺乏突变体在根尖的径向膨胀中破坏了根尖的径向膨胀，比野生型植物更好地渗透到压实的土壤中。对生长素和ABA的联合生长反应降低了根系穿透压实土壤的能力。土壤压实是一项重大的农学挑战，它抑制了根的伸长并影响了作物产量。根利用乙烯来感觉土壤的紧实度，因为受限的空气空间导致这种气体信号在根尖周围积累。乙烯抑制压实土壤中根的伸长和促进径向膨胀，但其机理尚不清楚。在这里，我们报告了乙烯促进脱落酸(ABA)的生物合成和皮质细胞的径向扩张。水稻ABA生物合成基因突变体减弱了紧实土壤中皮层细胞的径向膨胀，导致了更好的渗透性。土壤压实诱导的乙烯还上调生长素生物合成基因OsYUC8。缺失OsYUC8的突变体能够更好地渗透压实土壤。生长素内流转运体OsAUX1也需要在根压实反应过程中将生长素从根尖动员到伸长区。此外，osaux 1突变体比野生型根更好地穿透压实的土壤，并且没有表现出皮层细胞的径向膨胀。我们的结论是，乙烯利用生长素和ABA作为下游信号来调节水稻根细胞的伸长和径向膨大，导致根尖膨胀，降低其渗透压实土壤的能力。
Intensive agriculture and changing tillage practices are causing soils to become increasingly compacted. Hard soils cause roots to accumulate the hormone ethylene, triggering reduced root elongation and increased radial swelling. We demonstrate that ethylene regulates these distinct root growth responses using different downstream signals, auxin, and abscisic acid (ABA). Auxin is primarily required to reduce cell elongation during a root compaction response, whereas ABA promotes radial cell expansion. Radial swelling was originally thought to aid root penetration in hard soil, yet rice ABA-deficient mutants disrupted in radial swelling of root tips penetrate compacted soil better than wild-type plants. The combined growth responses to auxin and ABA function to reduce the ability of roots to penetrate compacted soil. Soil compaction represents a major agronomic challenge, inhibiting root elongation and impacting crop yields. Roots use ethylene to sense soil compaction as the restricted air space causes this gaseous signal to accumulate around root tips. Ethylene inhibits root elongation and promotes radial expansion in compacted soil, but its mechanistic basis remains unclear. Here, we report that ethylene promotes abscisic acid (ABA) biosynthesis and cortical cell radial expansion. Rice mutants of ABA biosynthetic genes had attenuated cortical cell radial expansion in compacted soil, leading to better penetration. Soil compaction-induced ethylene also up-regulates the auxin biosynthesis gene OsYUC8. Mutants lacking OsYUC8 are better able to penetrate compacted soil. The auxin influx transporter OsAUX1 is also required to mobilize auxin from the root tip to the elongation zone during a root compaction response. Moreover, osaux1 mutants penetrate compacted soil better than the wild-type roots and do not exhibit cortical cell radial expansion. We conclude that ethylene uses auxin and ABA as downstream signals to modify rice root cell elongation and radial expansion, causing root tips to swell and reducing their ability to penetrate compacted soil.
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影响因子：
7.4
作者：
Agrawal, GK;Yamazaki, M;Hirochika, H
通讯作者：
Hirochika, H
影响因子：
4.3
作者：
Pandey BK;Verma L;Prusty A;Singh AP;Bennett MJ;Tyagi AK;Giri J;Mehra P
通讯作者：
Mehra P
DOI：
10.1111/nph.17180
发表时间：
2021-07
期刊：
The New phytologist
影响因子：
--
作者：
Jacobsen AGR;Jervis G;Xu J;Topping JF;Lindsey K
通讯作者：
Lindsey K
拟南芥中对脓肿的双相生长反应涉及与乙烯和生长素信号通路的相互作用。
影响因子：
5.6
作者：
Li X;Chen L;Forde BG;Davies WJ
通讯作者：
Davies WJ
影响因子：
16.6
作者：
Giri J;Bhosale R;Huang G;Pandey BK;Parker H;Zappala S;Yang J;Dievart A;Bureau C;Ljung K;Price A;Rose T;Larrieu A;Mairhofer S;Sturrock CJ;White P;Dupuy L;Hawkesford M;Perin C;Liang W;Peret B;Hodgman CT;Lynch J;Wissuwa M;Zhang D;Pridmore T;Mooney SJ;Guiderdoni E;Swarup R;Bennett MJ
通讯作者：
Bennett MJ