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A Detailed Explanation of the Formation Process of Young Cactus Stems
Cacti bear little resemblance to ordinary terrestrial plants. They have no leaves, and their spindle-shaped or warty bodies are vastly different from the branches of ordinary plants. However, a few cacti, besides having typical cactus flowers, also produce common young stems and leaves, such as Pereskia. This genus consists of many-branched shrub-type or small tree-type plants. The young stems are round and slightly fleshy. Generally speaking, the lateral buds of flowering plants are borne in the leaf axils, and most of them merely become small buds without further growth. But in many plants, at least some of the lateral buds grow into short, slender shoots, such as those of <span style="color:#FF8000;">apple</span> trees and pear trees. On these young shoots, the new leaves are almost all borne at a single point . This point is remarkably similar to the areole of a cactus, because the spines of a cactus are in fact its modified leaves. </p> <p align="center"> </p> <p align="center"> Pictured: young cactus stem </p> <p>   In fact, some plants do have leaves modified into prickles, such as Berberis, in which transitional forms ranging from leaf-like spines to prickles have been found. Botanists call these modified leaves and buds prickles rather than spines (only bud-derived structures are called spines, such as those of Rubus). The spines of cacti are also formed by the modification of leaves, so the botanically correct term is also prickles. However, this book still refers to them as spines according to customary usage. When new shoots or flower buds emerge from an areole, it clearly demonstrates that the areole does indeed contain buds. Theoretically, every areole is capable of producing new shoots. If the new shoot above any areole is removed, a new shoot will emerge from that areole to replace the removed one. </p> <p>   The leaves of some Pereskia species have become very small and narrow. The genus Opuntia also has leaves, which are round but soon fall off. The leaf-like basal segments of many Opuntia plants are easily mistaken for flat new leaves. In fact, when young, these cacti still produce small and feeble leaves; new stem segments emerge from the areoles on the leaf-like stem segments, while true new leaves are no longer produced. </p> <p>   The round young stems of Pereskia often give rise to variants with hump-like, angular, or ridged stems. At this point, as the plant grows, the spirally arranged areoles become increasingly obviously arranged in longitudinal rows. The areoles of cacti with angular stems are also arranged spirally during their seedling stage. </p> <p>   The amount of water stored within the body of a cactus varies greatly with the seasonal alternation between rainy and dry seasons, and the ridged structure is particularly suited to this growth pattern. </p> <p>   When water is scarce in the dry season, the ribs become thinner; when water is abundant in the rainy season, the ribs thicken, yet the overall form of the plant does not change much. In other words, without any change in the plant's surface area, the internal water storage capacity differs greatly, like the bellows of an accordion. In contrast, the stem segments of pad-shaped cacti shrink irregularly when water is scarce. Moreover, the surface area of ribbed cacti is larger relative to the plant's total volume than that of other types (all green plants need a certain surface area to receive sunlight). </p> <p>   The number of ribs can increase to a great many. For example, many Trichocereus cacti bear a very large number of ribs, but the genus with the greatest number of ribs is Stenocactus, which can produce as many as 120 thin, cardboard-like ribs. The young stems of many climbing and epiphytic cacti are slender and long, slightly cylindrical, or bear only irregular hump-like protrusions. The thicker young stems bear ribs, and as the plant grows, these ribs eventually become thin and wing-like, which helps the plant grow healthily in a semi-shaded environment. Later, the three-winged stems eventually give rise to two-ribbed, leaf-like flat stems. </p> <p>   On many ribbed cacti, the protrusions on the ribs are more or less distributed in a hump-like pattern. If sunlight shines directly from above, the various protrusions will to some extent shade one another from the sun. Therefore, when the shape of the ribs is clearly distinguishable, one can see that the ribs are mostly arranged in a spiral. If the ribs are composed of isolated, unconnected warty protrusions, as in Rebutia or Mammillaria, then the spiral direction of the ribs is difficult to discern, and only chains of warty protrusions arranged in intersecting diagonal rows can be seen on the plant surface. As with the arrangement of leaves, the number of warty protrusions in each row is often 5, 8, 13, 21, 34... that is, each number is the sum of the previous two. This arrangement allows the warty protrusions to be distributed densely and evenly, and maximally ensures that they do not shade one another from the sun. </p> <p>   Cacti that bear large warty protrusions differ most in form from ordinary cacti. These warty protrusions superficially resemble leaves, as in Ariocarpus or Obregonia, but the warty protrusions bear an areole, and flowers can emerge from within the areole. Therefore, the warty protrusions are not leaves but part of the stem. On some small spherical or leaf-like cacti, such as Blossfeldia or Lophophora, the spindle ridges can only be identified by the arrangement of the areoles. </p> <p>   Recommended articles: </p> <p>   The External Structure and Morphology of Cacti </p> <p>   An Evolutionary Overview of the "Living Fossil" Cacti </p> <p>   Cacti Shed Their High-Priced "Outer Garment" and Are Replaced by Low-Priced Ones </p> <p>   In Summer, Small Potted Plants Are Sought After, and Cacti Rank at the Top </p>
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What is the guiding philosophy of industrialized walnut management
1. What is industrialized walnut management? The essence of industrialized agricultural management is to use the methods of managing modern industry to organize modern agricultural production and management. It is oriented by domestic and international markets, centered on improving economic benefits, supported by scientific and technological progress, and revolves around
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What are the basic characteristics of walnut industrialization development?
Basic characteristics of walnut industrialization. Compared with traditional closed walnut production and operation, industrialized walnut operation has the following basic characteristics: (1) Market orientation. The market is the starting point and the destination of walnut industrialization. The operation of agricultural industrialization must be guided by domestic and international markets, changing the traditional closed state of self-sufficient small-scale peasant economy and self-service, with its resource allocation, combination of production factors, and purchase and sale of means of production and products being allocated and realized through market mechanisms.
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What are the main problems faced by industrialized agricultural operations?
Generally speaking, China's agricultural industrialization has achieved considerable development in recent years, but at the same time, we must also clearly recognize that the overall level of China's agricultural industrialization is still not high, and there are still some problems that need to be solved urgently in its development. 1. Agriculture
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A Detailed Explanation of the Strategic Management of Walnut Industrialization
1. Optimize the layout and highlight distinctive features. Agricultural industrialization is the breakthrough point for advancing the strategic restructuring of agriculture and the rural economy, developing the rural economy, and increasing farmers' incomes. As a suitable tree species for most of China's arid and rain-scarce ecological regions, the walnut, as a newly developed advantageous industry, will make an important contribution to the management of agricultural industrialization.
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How to advance agricultural industrialization? A summary of countermeasures and suggestions
1. Formulate a policy system for agricultural industrialization. Use policies to create a social environment, implement a new economic system, and invigorate the industrialization management mechanism. This includes reform of the property rights system, expansion of investment and financing channels, strengthening technological innovation and cooperation, and cultivating core competitiveness.
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Is the coconut crab a spider? One article explains the origins and prices of terrestrial arthropods
The coconut crab, also known as the bagua crab, is a terrestrial arthropod wild animal in our country, famous for its delicious meat, rarely seen on the general market, so its price is very high, so is the coconut crab a spider? Where is its origin? How much does one cost? No, the coconut crab is a hermit
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Are centipedes poisonous? How to repel and kill centipedes that get into your home
The centipede is a terrestrial arthropod, flat and elongated in shape, 9-17 cm long and 0.5-1 cm wide, made up of 22 segments. It likes to live in damp, dark places, is relatively common in summer, and generally comes out at night. So, are centipedes poisonous? How do you repel or kill them when they get into your home?
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Is a soft-shelled turtle a fish? Let's get to know the true identity of the soft-shelled turtle
The soft-shelled turtle is not a fish, but an aquatic and terrestrial amphibious reptile, and is the general term for soft-shelled aquatic turtles of the family Trionychidae in the order Testudines. Soft-shelled turtle is the common name for the soft-shelled turtle, also called tuanyu or shuiyu, and in some southern places it is called tanyu or jiayu. Its head resembles that of a turtle, but its carapace lacks the stripes of a turtle, and its shell is softer than
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How Do Spiders Survive the Winter? A Detailed Explanation of Spider Overwintering Methods
Spiders are the most abundant predatory natural enemies in terrestrial ecosystems, capable of preying on some pests harmful to agriculture, and play a role that cannot be ignored in maintaining the stability of agricultural and forestry ecosystems. There are many kinds of spiders; according to records, there are 3821 genera and 42
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