Discuss the difference between germination rate, mean germination time, and germination uniformity
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Answer:
How and why to measure the germination process? MARLI A. RANAL1,3 and DENISE GARCIA DE SANTANA2 (received: August 18, 2005; accepted: January 26, 2006) ABSTRACT – (How and why to measure the germination process?). In the last two centuries, papers have been published including measurements of the germination process. High diversity of mathematical expressions has made comparisons between papers and some times the interpretation of results difficult. Thus, in this paper is included a review about measurements of the germination process, with an analysis of the several mathematical expressions included in the specific literature, recovering the history, sense, and limitations of some germination measurements. Among the measurements included in this paper are the germinability, germination time, coefficient of uniformity of germination (CUG), coefficient of variation of the germination time (CVt), germination rate (mean rate, weighted mean rate, coefficient of velocity, germination rate of George, Timson’s index, GV or Czabator’s index; Throneberry and Smith’s method and its adaptations, including Maguire’s rate; ERI or emergence rate index, germination index, and its modifications), uncertainty associated to the distribution of the relative frequency of germination (U), and synchronization index (Z). The limits of the germination measurements were included to make the interpretation and decisions during comparisons easier. Time, rate, homogeneity, and synchrony are aspects that can be measured, informing the dynamics of the germination process. These characteristics are important not only for physiologists and seed technologists, but also for ecologists because it is possible to predict the degree of successful of a species based on the capacity of their harvest seed to spread the germination through time, permitting the recruitment in the environment of some part of th
Explanation:
Introduction During the last two centuries, several methods and mathematical expressions to measure the germination 1. 2. 3. Universidade Federal de Uberlândia, Instituto de Biologia, Caixa Postal 593, 38400-902 Uberlândia, MG, Brasil. Universidade Federal de Uberlândia, Instituto de Ciências Agrárias, Caixa Postal 593, 38400-902 Uberlândia, MG, Brasil. Corresponding author: [email protected] process have been proposed or discussed (Czabator 1962, Nichols & Heydecker 1968, Goodchild & Walker 1971, Heydecker 1973, Labouriau 1983a, Scott et al. 1984, Brown & Mayer 1988, Hilhorst & Karssen 1988, Carneiro et al. 1993, Bewley & Black 1994, Santana & Ranal 2004). It is wholesome and welcome, but the diversity of expressions has made comparisons difficult. Several of these expressions have the same name, measuring different characteristics of the germination