Seed mass affects emergence but not germination in native grassland forage species

IF 2.8 3区环境科学与生态学 Q2 ECOLOGY

Restoration Ecology Pub Date : 2024-08-05 DOI:10.1111/rec.14248

Clara Milano, Daniel Roberto Pérez, María Cecilia Scarfó, Dana Aylen Rodríguez, Selva Yanet Cuppari, Alejandro Loydi

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引用次数: 0

Abstract

For ecological restoration of degraded grasslands, species selection and knowledge of the species biology are essential. Seed germination and seedling establishment, as well as seed regenerative traits, can partially determine direct seeding success in this context. The objectives of this study are (1) to characterize the seeds of 29 native forage species of the Pampa Austral grasslands, (2) to evaluate their germination and emergence, and (3) to evaluate the relationship between germination and emergence and seed traits (mass, length, width, and length/width ratio), to test the usefulness of these traits for rapid species selection. We studied the germination percentage of untreated (UG) and treated (TG) seeds under laboratory conditions of 29 native forage species (four legumes, nine cool season, and 16 warm‐season grasses) and the percentage of field emergence (FE) for 17 of those species, selected based on their UG. Additionally, all species were characterized, including thousand‐seed mass, length, width, and length/width ratio. Average UG was 53.30 ± 3.17% for Poaceae and 25.63 ± 5.73% for Fabaceae. Four cool season and eight warm‐season grasses had UG greater than 60%. Mean FE was 35.18 ± 0.66% 2 months after sowing. FE has a direct relationship with seed mass (r2 = 0.69; p < 0.001), while this relationship was not observed for UG under laboratory conditions (r2 = 0.15; p = 0.7174). In Pampa Austral grasslands, seed mass proved to be a relevant trait for species selection given its strong relationship with FE.

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种子质量影响原生草地牧草物种的萌发，但不影响发芽

要恢复退化草地的生态，物种选择和物种生物学知识至关重要。在这种情况下，种子的萌发和幼苗的建立以及种子的再生特性可以部分地决定直接播种的成功与否。本研究的目的是：(1) 分析澳大利亚潘帕草原 29 种原生牧草种子的特征；(2) 评估其发芽率和出苗率；(3) 评估发芽率和出苗率与种子性状（质量、长度、宽度和长宽比）之间的关系，以检验这些性状是否有助于快速选择物种。我们研究了 29 种本地牧草（4 种豆科植物、9 种冷季型牧草和 16 种暖季型牧草）在实验室条件下未经处理（UG）和经处理（TG）种子的萌发率，以及根据其 UG 挑选出的其中 17 种牧草的田间萌发率（FE）。此外，还对所有物种进行了特征描述，包括千粒重、长度、宽度和长宽比。草本植物的平均 UG 为 53.30 ± 3.17%，豆科植物的平均 UG 为 25.63 ± 5.73%。4 种冷季型和 8 种暖季型禾本科植物的 UG 大于 60%。播种 2 个月后，平均 FE 为 35.18 ± 0.66%。FE与种子质量有直接关系（r2 = 0.69; p <0.001），而在实验室条件下，UG没有观察到这种关系（r2 = 0.15; p = 0.7174）。在南潘帕草原，种子质量被证明是物种选择的一个相关性状，因为它与FE有密切关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Restoration Ecology 环境科学-生态学

CiteScore

6.50

自引率

15.60%

发文量

226

审稿时长

12-24 weeks

期刊介绍： Restoration Ecology fosters the exchange of ideas among the many disciplines involved with ecological restoration. Addressing global concerns and communicating them to the international research community and restoration practitioners, the journal is at the forefront of a vital new direction in science, ecology, and policy. Original papers describe experimental, observational, and theoretical studies on terrestrial, marine, and freshwater systems, and are considered without taxonomic bias. Contributions span the natural sciences, including ecological and biological aspects, as well as the restoration of soil, air and water when set in an ecological context; and the social sciences, including cultural, philosophical, political, educational, economic and historical aspects. Edited by a distinguished panel, the journal continues to be a major conduit for researchers to publish their findings in the fight to not only halt ecological damage, but also to ultimately reverse it.