A digital cucurbit gourd stock cap active stripping method based on hygroscopic asymmetric and embryo axis directional pushing

Abstract

This invention discloses a hormone-free, active seed coat decapping method for gourd rootstock based on hygroscopic asymmetry and hypocotyl directional pushing, belonging to the field of plant seedling technology. It includes seed screening and disinfection, high-intensity light drying pretreatment, hydrophobic layer application, constant-temperature germination, preparation of directional guide grooves, directional sowing, and moisture-controlled seedling management. By coating the non-hilum end of the outer seed coat with a hydrophobic layer, water enters only from the exposed hilum end. The difference in water absorption and swelling rates between the inner and outer seed coats generates curling tension, achieving active pre-cracking of the seed coat. Combined with the directional guide grooves in the seedling trays, the hypocotyl is forced to grow in a fixed direction, enhancing the decapitation ability. Furthermore, a mathematical model is used to quantify and adaptively regulate the seed dormancy index, hygroscopic asymmetry dynamics, seed coat cracking critical water potential, hypocotyl pushing mechanics, and moisture-controlled management, combined with an image sensor to achieve closed-loop digital control. This invention requires no exogenous hormones, has a high decapitation rate, produces robust seedlings, and is suitable for large-scale, intelligent gourd rootstock seedling cultivation.

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