PURPOSE: An lbLEA14 gene originated from sweet potato and a lignin biosynthesis increase method of plants using the same are provided to develop transgenic plants having environmental stress resistance which is suitable for condition disadvantage regions through changing the lignin content. CONSTITUTION: A lignin biosynthesis increase method of plants includes a step of over-expressing the IbLEA14 gene by transforming the recombinant vector which includes the lbLEA(Late embryogenesis abundant)14 gene into the plant cells. The IbLEA14 gene is composed of the base sequence described in the sequence number 1(SEQ ID NO:1). A manufacturing method of the transgenic plant with an increased lignin biosynthesis comprises the following steps: transforming the plant cells by using the recombinant vector which includes the IbLEA14 gene originated from sweet potato； and re-differentiating the plants from the transformed plant cells. The transformed plants having increased lignin biosynthesis is obtained by being transformed by the recombinant vector including the IbLEA14 gene which is originated from sweet potato.본 발명은 고구마(Ipomoea batatas) 유래 IbLEA14 (Late embryogenesis abundant 14) 유전자를 이용하여 식물의 리그닌 생합성을 증가시키는 방법, 상기 IbLEA14 유전자를 이용한 리그닌 생합성이 증가된 형질전환 식물체의 제조 방법, 상기 방법에 의해 제조된 리그닌 생합성이 증가된 형질전환 식물체 및 이의 종자, 상기 IbLEA14 유전자를 포함하는 식물체의 리그닌 생합성 증가용 조성물 및 상기 리그닌 생합성이 증가된 형질전환 식물체로부터 얻어지는 바이오에너지에 관한 것이다.
