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The chemical complex which controls the chemotropic movement of the pollen tube in style is
K+, salts, amino acids
Organic acids, K+
Ca, B, inositol sugar complex
Phenols and lignins
Answers (1)
During the process of pollination, the pollen tube grows through the style, a structure that connects the stigma to the ovary in flowering plants. The growth of the pollen tube is guided by chemical signals emitted from the ovary, commonly known as guidance cues. These guidance cues attract the pollen tube toward the ovary, allowing it to reach the ovule for fertilization.
Calcium ions (Ca²?) play a significant role in the guidance of pollen tubes. Calcium acts as a second messenger and is involved in various intracellular signaling processes. It is released in specific regions of the style, forming a calcium gradient that guides the pollen tube's growth direction. Inositol sugars, including inositol and its derivatives, are known to play important roles in plant signaling and development. While inositol sugars are involved in numerous cellular processes, their specific role in pollen tube guidance and chemotropism is still an area of ongoing research. The availability of boron can affect the directional growth of pollen tubes. A proper balance of boron is necessary for guiding the pollen tube toward the ovary by providing chemical cues and maintaining the structural integrity of the style. Hence, the correct answer is option 3.
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