Page 41 - 《华中农业大学学报》2025年第5期

第 5 期 马晓诺 等：长江中下游主栽水稻钾高效品种筛选及其生理生化特征 35

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+
cal for K uptake in rice roots and is modulated by the rice 11-19］.https：//doi.org/10.1371/journal.pone.0072541.

Screening potassium efficient rice varieties mainly planted
in middle and lower reaches of Yangtze River and

its physiological and biochemical characteristics

MA Xiaonuo,HOU Xingyu,CAI Hongmei
College of Resources and Environment，Huazhong Agricultural University，Wuhan 430070，China

Abstract 57 rice varieties mainly planted in the middle and lower reaches of Yangtze River were
used to study the physiological and biochemical characteristics of potassium efficient rice varieties planted in
this region.Hydroponic culture was conducted to screen potassium utilization efficiency.The potassium effi­
cient and potassium inefficient rice varieties were used to analyze the differences in growth，yield formation，

absorption and translocation of potassium，the expression level of related genes with hydroponic culture，soil
pot experiment，and field assay.The results showed that the potassium efficient and potassium inefficient
rice variety was determined to be Xiangliangyou No.16（23#） and Xinganxiangzhan（14#）.The potassium
efficient rice variety had better root architecture and biomass under both +K and −K treatments，with sig­
nificantly higher plant height，root length，number of root tips，total surface area and volume of roots，and
dry weight of roots and shoots compared to that of potassium inefficient rice variety.The effective number of
spikes，spike length，thousand-grain weight，and grain yield of the potassium efficient rice variety was high­
er than that of the potassium inefficient rice variety.The absorption，translocation and utilization of potassi­
um in potassium efficient rice variety was significantly higher than that in the potassium inefficient rice vari­
ety.The accumulation of potassium in roots and shoots，the absorption of potassium in plant，potassium utili­
zation index，and distribution ratio in grains of potassium efficient rice variety were all significantly higher
than that of the potassium inefficient variety.The expression level of OsAKT1，OsHAK1，OsHAK4，OsH⁃
KT2；1，OsKAT2，and OsKAT3 gene in the potassium efficient rice variety was significantly higher than
that in the potassium inefficient rice variety.It is indicated that excellent root architecture，stronger absorp­
tion capacity of potassium，efficiently transporting potassium to shoot，and distributing more potassium to
grains are important characteristics of the potassium efficient rice variety.
Keywords rice； potassium utilization efficiency； architecture of root system； absorption and translo­
cation of potassium； gene express； yield

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