Root Anatomical and Physiological Responses of Interspecific Sugarcane Hybrids to Simulated Drought Stress in Early Rainy Season Sugarcane Production Systems
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Abstract
Interspecific hybrid sugarcane results from crosses between commercial sugarcane and wild sugarcane (Saccharum spontaneum), which enhances genetic diversity and drought tolerant capacity. This study aimed to evaluate root anatomical characteristics and physiological traits of BC1 sugarcane clones with varying degrees of drought tolerance. The experiment was conducted under pot conditions using a 2 × 4 factorial design in a randomized complete block design (RCBD). Factor A consisted of two water management levels: 1) well-watered with soil moisture maintained at field capacity, and 2) water-withholding during early growth for 18 days (30-48 days after transplanting). Factor B comprised four BC1 sugarcane clones: BC1-21, BC1-44, -tolerant clone BC1-50 and BC1-63 -susceptible clone. BC1-44 exhibited superior capacity to maintain growth and physiological functions compared to other clones, displaying high drought tolerant indices across multiple parameters including tiller number, photosynthetic rate, SPAD chlorophyll meter reading (SCMR), and transpiration rate. Root characteristics revealed particularly BC1-44, possessed greater root length, surface area, and volume compared to other genotypes. Additionally, this clone exhibited root anatomical features conducive to water transport efficiency, including abundant xylem vessels and appropriately sized vascular bundles at both the basal and distal regions of the root. In contrast, the susceptible clone BC1-63 demonstrated fewer but larger xylem vessels and lower drought tolerant index (DTI) values in certain characteristics. The understanding in the differential response of these clones will support the improvement of interspecific hybrid sugarcane breeding programs to enhance drought tolerance during early growth stages, thereby increasing the efficiency of sugarcane production systems during the early rainy season.
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บทความในวารสารเกษตรนเรศวรที่ได้รับการตีพิมพ์ เป็นลิขสิทธิ์ของ คณะเกษตรศาสตร์
ข้อความที่ปรากฏในบทความแต่ละเรื่องในวารสารนี้เป็นความคิดเห็นส่วนตัวของผู้เขียนแต่ละท่านไม่เกี่ยวข้องกับคณะเกษตรศาสตต์ฯ
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