Tomato (Solanum lycopersicum): botany, history, uses, and cultivation
Tomato — a widely grown berry of the nightshade family used worldwide as a culinary vegetable. Overview of botany, varieties, history, nutrition, cultivation and notable legal and cultural distinctions.
Overview
The tomato (Solanum lycopersicum) is a domesticated plant in the nightshade family (Solanaceae) cultivated for its edible fruit. Botanically the tomato is classified as a berry and is produced by a flowering plant; in everyday cooking it is treated as a culinary vegetable. Tomatoes vary greatly in size, shape, color and flavor, from tiny cherry fruits to large beefsteak specimens, and from bright red to yellow, orange, green or purple hues.
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Botanical characteristics
As a plant, the tomato is typically a sprawling herbaceous vine, often trained on stakes or cages when grown for fruit. Plants can be determinate (bushy, fruiting over a short season) or indeterminate (vining, producing over a longer period). The flowers are small and yellow, giving rise to the fruit: a fleshy pericarp surrounding locules filled with seed-bearing gel. Tomatoes are climacteric fruit, meaning they continue to ripen after harvest through ethylene-driven processes.
Varieties and forms
Gardeners and growers select tomatoes for texture, taste and use. Common categories include:
- Cherry and grape tomatoes — small, sweet, often eaten raw.
- Plum (paste) tomatoes — firmer, used for sauces and canning.
- Heirloom varieties — open-pollinated types prized for distinctive flavors and colors.
- Beefsteak and slicing types — large fruits for sandwiches and fresh use.
History and domestication
Tomatoes originated in western South America and were domesticated in Mesoamerica. They were brought to Europe in the 16th century after contact between the Americas and Eurasia and were gradually incorporated into cuisines worldwide, most famously in Mediterranean dishes such as Italian sauces. Over centuries of selective breeding, a vast diversity of cultivars has been developed for taste, yield, disease resistance and climate adaptation.
Uses, nutrition and culinary role
Tomatoes are used raw in salads and salsas, cooked into sauces, soups and stews, concentrated into pastes and ketchups, and preserved by canning or drying. They are a substantial source of vitamin C, potassium and the antioxidant lycopene, which contributes to their red color. Flavor comes from a balance of sugars, organic acids and volatile compounds; ripe tomatoes are valued for their balance of sweetness, acidity and umami.
Cultivation, pests and postharvest
Tomatoes are grown commercially and in home gardens, under open field, greenhouse and hydroponic systems. Cultivation practices include pruning, staking and grafting to improve vigor and disease tolerance. Common problems include fungal diseases, bacterial blights and physiological disorders such as blossom-end rot (often linked to calcium imbalance). Postharvest handling focuses on managing ripeness and preventing bruising, since tomatoes continue to ripen after picking.
Distinctions and notable facts
Although botanically a fruit and specifically a berry, many cultures and legal systems treat tomatoes as vegetables for culinary and regulatory purposes; a well-known U.S. court decision in 1893 classified them as vegetables for tariff laws. Ecologically, tomato seeds are adapted for animal-mediated dispersal in wild relatives. Today the tomato remains one of the world’s most important vegetable crops, central to cuisines across continents and subject to continuous breeding and agricultural innovation.
Description
Vegetative characteristics
The tomato plant is a herbaceous annual, biennial or occasionally perennial plant that initially grows upright, but later becomes prostrate and creeping. The individual branches can grow up to 4 m long. The stems are 10 to 14 mm in diameter at the base, green, with fine hairs and usually tomentose towards the tip. The pubescence consists of simple, unicellular trichomes up to 0.5 mm long, and sparsely distributed multicellular trichomes up to 3 mm long, usually consisting of up to ten cells. Especially the longer trichomes often have glandular tips, which give the plant a strong smell.
The sympodial units usually have three stem leaves, the internodes are 1 to 6 cm long, occasionally longer. The stem leaves are interruptedly pinnate, 20 to 35 cm (rarely only 10 cm or more than 35 cm) long and 7 to 10 cm (rarely only 3 cm or more than 10 cm) wide. They are sparsely hairy on both sides, the trichomes resembling those of the stems. The petiole is 1.2 to 6 cm long or occasionally longer.
The main stem leaves are in three or four (rarely five) pairs. They are ovate or elliptic in shape, the base is oblique and running towards the base of the whole leaf, truncate or cordate. The margins are toothed or notched, especially near the base, and rarely they are entire or deeply toothed or lobed. The apex of the subleaves is acute or acuminate. The uppermost leaflet is usually larger than the lateral leaflets, 3 to 5 cm long and 1.5 to 3 cm wide. The petiole is 0.5 to 1.5 cm long. The tip is usually pointed. The lateral subleaves are 2 to 4.5 cm long and 0.8 to 2.5 cm wide, attached to petioles 0.3 to 2 cm long.
The second-rank subleaves are mostly located on the side of the lower main subleaves facing the leaf tip. They are 0.2 to 0.8 cm long and 0.1 to 0.5 cm wide, they are sessile or stand on a stalk up to 0.4 cm long. Third-rank subleaves are absent. There are usually six to ten intercalary leaflets between the main leaflets. These are 0.1 to 0.8 cm long and 0.1 to 0.6 cm wide, on petioles 0.1 to 0.3 cm long. False stipules are not formed.
Inflorescences and flowers
The inflorescences grow up to 10 cm long, consist of five to fifteen flowers and are mostly undivided or rarely split into two branches. The inflorescence stem is shorter than 3 cm and hairy similar to the stems. The inflorescence pedicels are 1 to 1.2 cm long, and the outer third is jointed. The shape of the inflorescence is a coil.
The buds are 0.5 to 0.8 cm long and 0.2 to 0.3 cm wide and straight conical in shape. Before flowering, the corolla protrudes about halfway from the calyx. At flowering, the calyx tube is very fine and covered with calyx lobes up to 0.5 cm long. These are linear in shape, pointed towards the front and covered with long and short, simple, single-rowed trichomes. The bright yellow, pentagonal corolla is 1 to 2 cm in diameter, often banded and in some cultivated forms with more than five tips. The corolla tube is 0.2 to 0.4 cm long, the corolla lobes are 0.5 to 2 cm long, 0.3 to 0.5 cm wide, narrowly lanceolate in shape, and sparsely covered at the apex and margins with intertwined, single-rowed trichomes up to 0.5 mm long. At flowering time the corolla lobes are protruding.
The stamens are fused into a tube, this is 0.6 to 0.8 cm long and 0.2 to 0.3 (rarely up to 0.5) cm wide. It is narrowly conical in shape and straight. The filaments are very fine and only 0.5 mm long, the anthers are 0.4 to 0.5 cm long and have a sterile appendage at the tip that is 0.2 to 0.3 cm long and never more than half the total length of the anthers. The ovary is conical, with fine glandular hairs. The style is 0.6 to 1 cm long and measures less than 0.5 mm in diameter. It usually does not protrude beyond the stamen tube. The stigma is cephalic and green.
Fruits and seeds
The fruits are berries, usually measure 1.5 to 2.5 cm in diameter, but can also grow up to 10 cm in cultivated plants. Since the fruit is formed from two carpels, it has two chambers with numerous ovules. These are connected by a centrally located placental tissue. The number of carpels and thus of chambers can vary, mainly due to breeding. The fruit shape is usually approximately spherical, other growth forms such as oval-elongated or pear-shaped are also possible, also due to breeding.
The fruits ripen to a strong red, yellow or dark orange due to the carotenoid content and here in particular due to the lycopene, are initially hairy, but become hairy when ripe. The flower stalk has increased in length to 1 to 3 cm by the time the fruit ripens, and is often thickened in varieties with large fruits. It is straight or bent at the point of articulation towards the inflorescence axis. The calyx is also enlarged on the fruit, the calyx lobes are about 0.8 to 1 cm long and 0.2 to 0.25 mm wide and sometimes strongly bent backwards.
The fruits contain a large number of seeds. These are 2.5 to 3.3 mm long, 1.5 to 2.3 mm wide and 0.5 to 0.8 mm thick. They are inverted ovoid, pale brown and covered with hair-like outgrowths of the outer cells of the seed coat. These are either adpressed, giving the seeds a velvety surface, or shaggy. The seeds are narrowly winged at the apex (0.3-0.4 mm) and acuminate at the base. The seed coats consist in the outermost cell area of strongly slimy cylindrical epithelium, which is botanically called myxotesta. Between the individual seeds is a gelatinous tissue formed by the placenta.
Chromosome number
The chromosome number is 2n = 24.
Systematics
Within the nightshades (Solanum), the tomato is classified in the subgenus Solanum and within this in the section of tomatoes (Solanum sect. Lycopersicon). Within this section, the species forms the Lycopersion group together with Solanum pimpinellifolium, Solanum cheesmaniae and Solanum galapagense, all of which produce red to orange fruits.
Various approaches have been taken to subdivide the species, especially since the 20th century, but none of them has been successful. Often, small, red and yellow fruits were called Solanum lycopersicum var. cerasiforme or Lycopersicon esculentum var. cerasiforme (colloquially often "cherry tomatoes"). It has been assumed that these correspond to the wild form of the species Solanum lycopersicum or are at least very close to it. However, they are probably cultivars and sometimes crosses with wild tomato species such as Solanum pimpinellifolium. These and all other varieties within the species are not recognized and are only listed as synonymous to Solanum lycopersicum.
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AlegsaOnline.com Tomato (Solanum lycopersicum): botany, history, uses, and cultivation Leandro Alegsa
URL: https://en.alegsaonline.com/art/100426
Sources
- solanaceaesource.org : "Phylogeny"
- britannica.com : "Tomato Description, Cultivation, & History"