https://emsenn.net/tags/drought/ Recent content in Drought on emsenn.net Hugo en-us Thu, 02 Apr 2026 00:00:00 +0000 https://emsenn.net/library/domains/science/domains/biology/domains/botany/terms/abscisic-acid/ Thu, 02 Apr 2026 00:00:00 +0000 https://emsenn.net/library/domains/science/domains/biology/domains/botany/terms/abscisic-acid/ <p>Abscisic acid: a C₁₅ terpenoid hormone primarily regulating water-stress responses. Despite its name — historically derived from its role in <em>abscission</em> (leaf/fruit drop) — ABA is not the primary driver of abscission (that role belongs to <a href="ethylene.md" class="link-internal">ethylene</a>). Instead, ABA is the plant&rsquo;s central drought and stress-response hormone, coordinating stomatal closure, seed dormancy, and tolerance mechanisms across tissues. ABA accumulates rapidly in response to water deficit, activating a cascade that prioritizes survival over growth.</p>