RESUMEN

For much of the twentieth century, plant physiologists considered themselves in an ideal position to study and explain the functions and processes of plants. Much of that authority stemmed from plant physiologists' long-standing commitment to experimental control and the integration of the physical sciences into biological practice. This article places plant physiology back in the center of the story of the recent life sciences. It shows the development of parallel experimental research programs into environmental as well as genetic effects on growth and development in plant physiology and genetics, and notes that the pursuit of an experimental environment was celebrated as much as (and occasionally more than) a molecular vision of life throughout most of the twentieth century by much of the plant science community. Thus, this article concludes that the history of the recent life sciences needs new complementary narratives of plant physiology with genetics, new concepts with technological tools, and plant-sized scales with the molecular. The history of the 'Age of Biology,' as the plant scientists saw it, helps confront the issue first posed by Evelyn Fox Keller, namely that the history of genetics has overshadowed a larger history of experimental life science. My answer here is through a larger narrative of the rise of the complementary experimental sciences of genes and environments in the life sciences.

RESUMEN

This paper describes how, from the early twentieth century, and especially in the early Cold War era, the plant physiologists considered their discipline ideally suited among all the plant sciences to study and explain biological functions and processes, and ranked their discipline among the dominant forms of the biological sciences. At their apex in the late-1960s, the plant physiologists laid claim to having discovered nothing less than the "basic laws of physiology." This paper unwraps that claim, showing that it emerged from the construction of monumental big science laboratories known as phytotrons that gave control over the growing environment. Control meant that plant physiologists claimed to be able to produce a standard phenotype valid for experimental biology. Invoking the standards of the physical sciences, the plant physiologists heralded basic biological science from the phytotronic produced phenotype. In the context of the Cold War era, the ability to pursue basic science represented the highest pinnacle of standing within the scientific community. More broadly, I suggest that by recovering the history of an underappreciated discipline, plant physiology, and by establishing the centrality of the story of the plant sciences in the history of biology can historians understand the massive changes wrought to biology by the conceptual emergence of the molecular understanding of life, the dominance of the discipline of molecular biology, and the rise of biotechnology in the 1980s.

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RESUMEN

After Darwin, experimental biology sought to unravel organisms. By the early twentieth century, organisms were broadly conceived as the product of their heredity and their environment. Much historical work has explored the scientific attack on the genotype, particularly through the new science of genetics. This article explores the tandem efforts to assert experimental control over the environment in which plants grew and developed. The case described here concerns the creation of the first phytotron at Caltech by botanist and plant physiologist Frits Went. Opening in 1949, the phytotron was a plant laboratory that, across a series of rooms and chambers, kept genes constant while regulating and maintaining defined ranges of known environments. This article details the context in which the phytotron emerged, how the phytotron gained its sobriquet, and how it served to cement the "environment" as a category of biological knowledge. Describing the institutional context of Caltech, its interdisciplinary culture, and its encouragement of adopting technology into biological science, I argue that the phytotron and the commensurate category of the "environment", were the product of the familiar movement to integrate the physical and biological sciences. In addition, however, the creation of the phytotron was also a broader story of plant physiologists establishing a definition of the "environment" in both physical and technological terms.

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